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A vacuum flask (also known as a Dewar flask, Dewar bottle or thermos) is an insulating storage vessel that greatly lengthens the time over which its contents remain hotter or cooler than the flask’s surroundings. Invented by Sir James Dewar in 1892, the vacuum flask consists of two flasks, placed one within the other and joined at the neck. The gap between the two flasks is partially evacuated of air, creating a near-vacuum which significantly reduces heat transfer by conduction or convection.

Vacuum flasks are used domestically, to keep beverages hot or cold for extended periods of time, and for many purposes in industry.

The vacuum flask consists of two vessels, one placed within the other and joined at the neck. The gap between the two vessels is partially evacuated of air, creating a partial-vacuum which reduces heat conduction or convection. Heat transfer by thermal radiation may be minimized by silvering flask surfaces facing the gap but can become problematic if the flask’s contents or surroundings are very hot; hence vacuum flasks usually hold contents below the boiling point of water. Most heat transfer occurs through the neck and opening of the flask, where there is no vacuum. Vacuum flasks are usually made of metal, borosilicate glass, foam or plastic and have their opening stoppered with cork or polyethylene plastic. Vacuum flasks are often used as insulated shipping containers.

Extremely large or long vacuum flasks sometimes cannot fully support the inner flask from the neck alone, so additional support is provided by spacers between the interior and exterior shell. These spacers act as a thermal bridge and partially reduce the insulating properties of the flask around the area where the spacer contacts the interior surface.

Several technological applications, such as NMR and MRI machines, rely on the use of double vacuum flasks. These flasks have two vacuum sections. The inner flask contains liquid helium and the outer flask contains liquid nitrogen, with one vacuum section in between. The loss of precious helium is limited in this way.

Other improvements to the vacuum flask include the vapour-cooled radiation shield and the vapour-cooled neck,both of which help to reduce evaporation from the flask.

The best insulated, vacuum and Thermos flasks, tried and tested for both heat retention and the chill factor

Madeleine Howell

1 AUGUST 2019 • 10:35AM

An insulated Thermos flask is a purchase that keeps paying back all year round. The best vacuum flasks perform a dual role: they keep hot liquid like coffee warm, and they keep cold drinks like iced water cool, for those boiling car journeys in the height of summer. Once you have one in your life, you’ll find it accompanies you to the office, to festivals, on camping trips, and even on holidays abroad.

How do Thermos flasks work? In short, they use a double walled construction, with the air removed from between these walls, forming a vacuum. Heat struggles to pass through the vacuum, meaning liquid stays at a roughly constant temperature.

To help you choose which one to invest in, I tried and tested a selection of flasks that promise to keep your beverages colder and hotter for longer, measuring how much heat was retained or how cool they kept respectively over a period of 12 hours.

To do this, I used a Thermapen (a professional thermometer considered the best by top chefs, available for £65 at John Lewis) to gauge the temperature of the contents at the beginning and end of 12-hours. Each flask was subjected to two 12 hours tests: for the first, I poured water from a recently boiled kettle into the flasks, took the temperature (usually around the 92 degrees mark), and then left them for half a day. And for the second, I added water with ice cubes, and waited.

You probably wouldn’t describe the scientific rigour as laboratory standard – but the tests did replicate the kind of environment you’d actually use these flasks in, either filling up your tea or coffee at the start of the day, or icing water. And the results were certainly interesting. While the cold water tended to record similar temperatures across products (with the exception of Klean Kanteen, which I’ll get to), there was a significant degree of difference when it came to heat retention. My conclusion is that if you really care about keeping your caffeine hot, you should choose your insulated flask wisely.

A note before I begin: the best way to clean a flask is to use warm water and washing up liquid, and rinse thoroughly with hot water. Always check whether your flask is suitable for the dishwasher before you begin. To remove difficult stains, Thermos recommend trying a teaspoon of bicarbonate of soda.

Here’s my guide to the best thermos flasks to keep you toasty and hydrated at all times…

: You can get FREE help and translator from Yiwu International Trade City in China

1. Stanley Classic

£42, Cotswold Outdoor

Why we like it: Bulletproof durability, a utilitarian aesthetic and supreme insulation make this the most functional flask of all

Stanley Classic

The Stanley Classic is the Daddy of all insulated flasks, and with good reason. My hot water was 84.6°C at 7:51pm, and at 7:51 am it was 70.8 °C – a temperature drop of a mere 13.8°C after 12 hours (far less than its competitors, as detailed below).

A big part of the appeal of the Stanley is that it makes you feel like an intrepid camper, thanks to the distinctive green branding. With a lifetime warranty, the iconic flask will survive even the wildest of adventures: since it was founded in 1913, Stanley bottles have survived -70 degree winds, 4,000 foot drops, speeding bullets and category 5 hurricanes (please do not try this yourself).

As well as promising to keep liquids hot or cold for up to 24 hours, it claims to keep iced water cold for up to 5 days. My cold water with ice was 2.8 °C at 10:56am, and at 10:56pm it was, miraculously, even colder – at 1.7 °C. I assume this is because I filled it with tap water and then added plenty of ice; thanks to the insulating properties of the Stanley, the water gets colder within before it warms up (if it ever does).

Tried and tested: a selection of market-leading insulated flasks to keep food and drink both hot and cold

Unlike many flasks, it is also dishwasher safe – a big bonus in my book. The lid doubles up as a decent-sized cup and provides extra insulation; a handle on the side makes it easy to lug around and grip while battling the elements, but there’s no chance of leakage. While primarily made up of stainless steel, some parts are plastic – but it is BPA-free (an industrial chemical used in water bottles and similar that many people prefer to avoid).

It weighs 822g when empty and doesn’t have a very wide mouth, and so works better for thinner liquids, although ice cubes do fit – check out the Stanley Adventure Food Jar for chunkier meals (£35, Cotswold Outdoor) and the Stanley Easy Fill Wide Mouth flask for sipping on the go (£20, Cotswold Outdoor).

It gets our vote as the best vacuum flask for camping and everyday life.

2. Thermos “Mondial” vacuum insulated glass double wall flask, 1.8l

£14.99, Argos

Why we like it: This Thermos flask is hot on the heels of the Stanley classic in terms of heat retention

After Stanley, I found the Thermos – a brand which has become synonymous with insulated flasks – to come a close second in terms of heat retention.

My gripe with this particular genuine Thermos brand flask (watch out for fakes) is that it is plastic on the outside and glass inside. The cups are plastic, too, rather than stainless steel. But like the Stanley it is BPA-free, and it kept liquids hotter than the other Thermos flasks I tried, which were composed primarily of stainless steel. It weighs 890g, which is lightweight considering its vast capacity.

My hot water was 91.3°C at 8:36pm; at 8:36am it was 75.7°C – a temperature drop of 15.6°C after 12 hours (not that much more than the Stanley, and still piping hot enough for a decent brew). My cold water was 4.4°C at 11:13am, and as with the Stanley, 12 hours later it was even colder – at 1.7 °C.

It comes with two cups with proper handles, so it’s a great tea flask. It works well for families and small groups, making 5 or so generous servings. The twist stopper has a cunning hidden compartment in which to store milk or sugar; which I liked.

Does the trick nicely for outdoor work, picnics, family trips or adventures.

3. Thermo Café by Thermos stainless steel vacuum insulated multi-purpose flask, 1.8l

£22.66, Amazon

Why we like it: A secret compartment for milk and sugar and a markedly wide mouth for stews and ice cubes

This Thermos Café by Thermos flask is less efficient at keeping the heat in, though not as bulky as the Thermos Mondial flask featured above. Composed primarily of stainless steel and also vacuum-insulated, it has a markedly wide mouth, so I’d say it’s one of the most versatile flasks I tried in terms of storing both liquids and thicker soups and stews. It’s a great hot food flask, as well as a hot water flask.

The cup is large enough as a serving bowl too and remains cleverly secure until the handle is locked in to prevent leakage when you’re carrying it around. However, it’s heavy, at just over a kilogram.

My hot water was 95.4°C at 7:56pm, and at 7:56am it was 76.3°C. That’s a temperature drop of 19.1°C after 12 hours. Meanwhile, my cold water was 4.5°C at 11:10am, and 1.5°C at 11:10pm.

Thermos, I decide, is ubiquitous for a reason – it works.

Buy now

4. Hydroflask wide mouth flask

£28.50, Amazon

The peacock of flasks, the Hydroflask comes in a range of bold, bright colours. The 946ml one I tried is the perfect size to take with you on a bike ride, a day at the beach or for a workout in a park (it weighs 440g when empty), but it doesn’t keep the heat in as efficiently as the Stanley or the Thermos.

My hot water was 92.3°C at 8:05pm, and by 8:05am it was 57°C – a temperature drop of 35.3°C after 12 hours. It’s still “warm” – just not as warm; and certainly not pipingly hot. My cold water with ice cubes is 5°C at 11:02 and 12 hours later its 3.5°C.

The wide mouth means it’s also suitable for soups and smoothies to take to work, and it will certainly keep them either sufficiently cold or hot until lunchtime. It’s available in a range of colours, which is fun, from canary yellow to baby blue via three shades of pink.

If you like the sound of the HydroFlask but you want a bigger one for multiple helpings, you might prefer to opt for the 128oz Oasis HydroFlask (£88.87, Amazon), which is great for groups and holds enough refreshment for everyone to share. The Oasis has a lid that screws completely off – meaning you can fill it with your favourite campfire supper, such as chilli con carne, or a delicious hot porridge for breakfast – and also a smaller lid that will unscrew for easy pouring.

Buy now

5. Red Original stainless steel bottle

£26.95, Red Original

Red Paddle Co manufacture paddle boards, but now they’ve also launched a versatile equipment range, Red Original. The kit can be used by anyone (no paddling required) and their marine-grade stainless steel water bottle is cleverly designed. The higher quality steel means it doesn’t corrode like other metal drinks bottles, and can withstand the elements.

One of its aims is to reduce the amount of plastic going into the ocean by encouraging the use of a steel bottle, so it is proudly 100pc BPA free.

Similarly to the likes of the Stanley, I like the aesthetic, and it also has a double wall construction to create a vacuum between the outside environment and inside liquid, helping to keep cold drinks cold or hot. The 750ml capacity holds around three cups of hot coffee (or the equivalent of a chilled bottle of white wine).

However, sadly, because it is largely stainless steel, the heat is lost quicker than it is through some of the other options here (a price you pay for being more environmentally friendly, I’m afraid). In terms of heat capacity, my trial hot water dropped by 28.6°C after 12 hours. My cold water is 5°C at 11:07am and 3.6°C at 11:07pm.

It has two different cap attachments – a canteen cap for unscrewing and pouring hot liquids – and a sports-style cap for easy sipping on the go. Both have rings to which you can attach a carabiner aluminium loop to secure it safely to your backpack, suitcase, or anything, really (including, of course, a paddle board). This makes it one of the best flasks for hiking.

If you want to carry your flask long distances, it’s a lightweight option – weighing 400g (14 ounces) with canteen cap, or 380g (13.4 ounces) with sports cap, while empty.

Buy now

6. Klean Kanteen TK Pro 750ml

£39.95, andkeep.com

I had high hopes for the Klean Kanteen TK pro. It’s eco-friendly credentials are sound, since it is 100pc free of all plastic. I purchased mine from the brilliant online shop And Keep, which specialises in reusable and sustainable products. However, if I am to judge it in terms of heat retention and keeping liquids and food cold, it didn’t perform at anywhere near the same level as the others featured in this guide.

My hot water was 93.6°C at 8:25pm, and I already had my suspicions, because the exterior was markedly hot compared to the others – a sure sign of heat escaping. At 8:25am it was 34.8°C – a significant temperature drop of 58.8°C after 12 hours. Unlike the other flasks, my cold water and cubes didn’t get colder – it got hotter. The marketing blurb says it keeps contents hot for 28 hours, or cold for 90 hours, which based on these results I can’t really see happening.

However, it is durable and robust and does come with a lifetime warranty. It weighs 723g, and if the environment is your number one priority, it’s still functional enough. Happy camping.

hether your choice of drink is a single malt or a bit of hard lemonade, a good flask will make discreet drinking much more pleasant. And while you may think any old flask will get the job done, there are a few things to consider.

First off, know where your flask will be carried to—is it for warming sips on big adventures, or for sly drinking? Second, pick your material accordingly. If your flask is going to be slipped into a suit jacket, consider a sleek leather case. If it will be tossing and tumbling in a backpack or hiking bag, consider a flask with a durable exterior. Either way, you’ll want a flask that won’t leave a metallic taste in your mouth and has an opening wide enough to sip comfortably.

That said, see our picks below of the best flasks available that range in quality, character, and price.

Best Overall: Stanley Classic Flask

Buy on AmazonBuy on WalmartBuy on Zappos

Stanley’s classic drinking flask is as quintessential a canteen as you can get. It hits the perfect sweet spot of affordable, thoughtfully constructed, and ultra-durable. The tote-anywhere flask has a sturdy, reliable body and holds a healthy 8 ounces of liquids.

Made of 18/8 BPA-free rugged stainless steel, double-wall vacuum insulation keeps outside temperatures from affecting your flask. Opt for the retro, 70s-inspired Hammertone green color, or give your flask a more updated exterior with Polar white or matte black options. The never-lose cap is built into the design—no hunting for a dropped minuscule cap on the forest floor.

Hip flasks are usually designed to be petite (they traditionally fit in a pocket, after all) but the Stanley flask is available in 5- and 8-ounce options. Or, upgrade the flask to a set that includes four handy shot glasses.

Best Splurge: Snow Peak Titanium Curve Flask

Buy on AmazonBuy on Snowpeak.com

Though Snow Peak’s Titanium Curved Flask is a splurge, its Grade A titanium construction reflects that—it will hold up for years to come. Each flask is made with care and finished by hand in Niigata, Japan, with methods that have been passed down for generations.

The titanium flask is a step above a stainless steel flask—the material is stronger than steel, and boasts highly inert properties that make the metal incredibly anticorrosive. Titanium also doesn’t hold the flavors of its contents, so notes of peaty scotch won’t linger far after you’ve sipped the last drop.

This curved flask holds just over six shots of liquid (6.4 ounces). Each flask holds six shots of liquor (or 5.8 ounces), though smaller 4.7-ounce versions are also available. All flasks come with a synthetic leather case, a custom gift box, and a replenishing funnel.

Good to Know:
If you tend to misplace things, keep an eye out for flasks with attached lids. Or, opt for a brand, like Snow Peak, that sells replacement lids.

Best for Outdoors: GSI Outdoors Boulder Flask

Best Value: Rabbit RBT Flask

Buy on AmazonBuy on Uncrate.com

This sleek flask from Rabbit is one of the smoothest ways to store liquor on the go. A subtle cap hides the traditional flask shape, but pop off the cap and you’ll find a smart flask model. Each flask is designed by a team of wine and cocktail lovers out of Seattle—the designers combine form and function, classic shapes, and pure geometry. Case in point, this updated hip flask is perfect for the modern drinker. A suave, matte black silicone exterior with classic gold accents gives a subtle art deco appeal.

Design aside, the flask is made with high-quality stainless steel and features a leak-free lid that snaps open and closes with ease—no twisting required (in other words, you can open the flask with one hand). Each flask has a liquid capacity of 6.5 ounces.

Best for Sharing: High Camp Firelight Flask

Buy on HuckberryBuy on Pottery Barn

Well-suited for taking on a quick hike, camping trip, or to the park, this share-ready flask from High Camp comes equipped with everything you need to split a drink with friends. The flask comes with two, six-shooter tumblers that attach seamlessly to the body of the flask using a magnetic locking system—the world’s first magnetic flask built for the outdoors. Each cup attaches to the BPA- and phthalate-free stainless steel flask. The lid is equipped with a leak-proof stainless steel plug cap with a silicone seal.

This double-wall vacuum-insulated flask holds 750mL—enough to hold an entire bottle of wine, whiskey, or your spirit of choice. Its leak-proof design also means you can pack the flask anywhere without worrying about your hiking clothes smelling like rum.

Good to Know:
Be cautious of the flasks you purchase. Many are made in bulk, constructed with cheap metals that don’t meet food safety standards. Paying a little extra can go a long way, and look for stainless steel: an inexpensive alloy that is corrosion-resistant and lightweight.

Best for Whiskey: BruMate Liquor Canteen

Buy on Brumate.com

BruMate’s bold canteens come in a range of statement-making patterns, from shimmering rose gold to funky tie-dye to black and white marble. Though the patterns look contemporary, this design is modeled after war-time gasoline cans, giving it a distinctly retro aesthetic.

The flask features a drop-proof silicone cover and a lid secured via a bendable silicone attachment. Each flask stands 6 inches high and holds 8 ounces of liquor. The brand’s line of flasks (along with its other products) is made of BevGuard technology that moderates temperatures—making it perfect for toasty or frigid conditions. BevGuard also prevents the metallic aftertaste that’s often found in stainless steel flasks, meaning the metal won’t leech or taint your drinks. If it does, send the flask back—the brand guarantees a lifetime warranty.

Related: The Best Bourbons Under $50

Best Heavy-Duty: VSSL Wilderness Navigation Flask & Flashlight

Buy on AmazonBuy on NordstromBuy on Uncommon Goods

Heading out into the great outdoors? This VSSL Wilderness Navigation Flask is equipped with everything you need for a good day of hiking, While it looks like a flashlight to the untrained eye, the lid unscrews to unveil a glass-lined flask (the glass lining won’t pick up unwanted odors). Also, hidden away in the flask? Two collapsible shot glasses, a bottle opener, plus outdoor essentials, like a working flashlight with a 4-mode LED light (including red and SOS) and a compass.

The flask holds 9 ounces of liquid and stands nine inches tall. It is made from military-grade aluminum. Batteries are included.

Related: The Best Rums

Best Budget: Bormioli Rocco Pocket Flask

Buy on AmazonBuy on The Container StoreBuy on Houzz

If you’re shopping for flasks on a budget, Bormioli Rocco makes an excellent option. It’s budget-friendly and holds a generous 8.5 ounces of liquid.

This flask is also made with glass, which won’t take on the flavors of whatever is inside. Consider this flask a great option if you’re infusing spirits, or, use it for olive oils or other liquids in the kitchen. The swing bottle stopper provides a strong, leak-proof seal.

Expect durable quality—the brand is known for making reliable glassware for bars. Of note, since this flask is glass it will make it prone to breakage if you’re tossing it in a hiking pack or picnic basket. Another downside is it is quite heavy, so it will be hefty to carry around.

Best Design: Viski Summit Flask

Buy on AmazonBuy on Walmart

Viski’s flask leans heavily on design, with a smooth copper finish and high-end look. It’s on the smaller side, able to hold just six ounces of liquid, but that said, at five inches tall it’s small enough to slip into a coat breast pocket or denim pocket.

This flask is plated in polished copper-plated stainless steel on the outside, with an electroplated finish to protect your drink from taking on any metallic flavors. Viski specializes in professional-quality barware, so trust this flask will hold up over time. This flask requires hand washing and to keep it lustrous, a good polish every six months. The cap screws on and is not attached.

Related: The Best Canadian Whiskies

Final Verdict

If you’re looking for a tote-everywhere flask, Stanley’s Classic Flask (view at Amazon) can’t be beat, hitting the perfect sweet spot of affordable, thoughtfully constructed, and durable. If you’re working with a larger budget, Snow Peak’s Titanium Curve Flask (view at Amazon) has built up a loyal fan base for a reason.

FAQs

How do you clean a flask?

The easy answer is soap and water. But if your flask has started to take on a smell, a bottle brush will help get into the corners for a deeper clean. Boiling water will help break down lingering scents, or if you’re looking for something more heavy-duty, add white vinegar or lemon juice and water to the flask, close it up, and give it a good shake.

How many ounces/liquid does a flask hold?

Flasks are available in a range of sizes, though the standard flask holds eight ounces. Larger flasks are available if you’re carrying drinks for two.

What alcohol is best for a flask?

The best thing to sip from a flask is hard liquor, be it scotch, rum, bourbon, brandy, or gin. Anything below 40% ABV—that means beer, wine, and cocktails—will not keep well in a flask.

Why Trust Liquor.com?

Kate Dingwall is an experienced spirits writer and glassware collector. She has been writing about the bar and spirits world for five years, from the best glassware to the most spirited tomes.

While Thermos may be a well known and generic term for a flask, it’s just one of many brands. In fact, the best flasks come in all shapes and sizes and under many names. Our recommendations below have managed to master the art and science of the vacuum flask – that ingenious, insulated container that does the job of a portable kettle or fridge without the need of a plug socket.

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Whether it’s a chunky “food flask”, sleek “vacuum bottle” or something in between, the job of a flask is to keep food and drink hot or cold without leaking, all day long. Some of the winners on our list can insulate for more than 24 hours, which is long enough to survive the toughest hike or most gruelling commute.

For this article, we’ve picked out several flasks that excel at insulation, leak-proofness, durability and, of course, value for money. Before you scroll on, take a look at our buying guide below for some helpful tips on buying the best flask.

How to choose the best vacuum flask for you

Flasks have come a long way and today’s best vacuum flasks are mini engineering marvels. Made from multiple layers of BPA-free and rust-proof stainless steel, these flasks should survive years of bumps and knocks, keeping you in hot cuppas and ice-cold drinks season after season.

They also win big on green points, doing away with the need to buy drinks in single-use cups. If your flask is big enough for lunch you can save on both money and plastic.

How much should I spend?

You can buy flasks for next to nothing but given how often you’re likely to use your flask, it’s worth spending a bit more for quality and durability.

You tend to get what you pay for when buying vacuum flasks. Of course, you can get flashy designer flasks but if you’re looking for quality alone you won’t have to spend more than about £25-£30. That may seem extravagant for a drinks container, but you’ll soon save much more on drinks and lunches.

What features should I look out for?

18/8-grade steel: Today’s best flasks are made from stainless steel that doesn’t secrete chemicals (they’re BPA-free, in other words) or weird flavours. The best of the best are made from 18/8-grade steel (aka 304-grade), whose high nickel content makes it rust-proof and extremely durable. It’s also non-magnetic, which may disappoint if you’d hoped to adorn your Thermos with fridge magnets.

Multi-wall insulation: Double-wall insulation creates a vacuumed layer, which is vital for keeping hot drinks hot and cold drinks cold. Some flasks include more layers for even better insulation. The 100% stainless steel construction of today’s flasks means there’s no risk of inner walls shattering when dropped.

The best flasks to buy

1. Stanley Master Vacuum Bottle 750ml: Best flask for keeping drinks hot and cold – for days

Price: £55 | Buy now from Amazon

New from the creators of the 106-year-old Stanley Classic, this sleek, rugged flask keeps hot drinks hot for longer than the promised 27 hours and iced drinks cold for a staggering 100+ hours (good luck if you’re caught out in a heatwave for that long, frankly). So if you’re packing the car for a camping trip, this is the flask to take.

The Master achieves its insulating magic with a ‘QuadVac’ quadruple-walled insulation system, made entirely from BPA-free 18/8-grade rust-proof steel. The insulated cup is made from the same stuff, and does a brilliant job of retaining a drink’s temperature while you take your time over lunch. The stopper is plastic but lined with steel, so your drink never comes into contact with plastic, and we found it to be reliably leak-proof.

Our only grumble is that the flask weighs nearly a kilo even before there’s anything in it, and isn’t available in a smaller size.

Key specs – Material: 18/8 stainless steel with steel-lined plastic inner cap (dishwasher-safe); Capacity: 750ml; Size: 30 x 8.8 x 8.8cm; Weight: 889g; Colours available: 1

2. Contigo Autoseal Chill water bottle: Best flask for cold drinks

Price: £24 | Buy now from Amazon

If you’re not a big hot drink fan but still want an exceptional flask to keep drinks cool on camping trips, long days and overnight stays, this slick offering from travel favourite Contigo is ideal. It claims to keep drinks cold for 28 hours and during our testing, it lived up to this. While the temperature will drop a tad when ice begins to melt, we found that iceless liquids were the same temperature 28 hours later as they were when first added. In some instances, they stayed chilly for far longer than the time stated too.

It’s 100% leak proof – no matter how hard we tried, we couldn’t get any liquid to escape and the automatic opening trigger means you can drink from it one-handed with ease. Finally, there’s an additional loop handle on top so it can easily be attached to bags or simply carried this way. All in all, this is brilliantly stylish and robust

Key specs – Material: stainless steel (plastic lid dishwasher safe); Capacity: 720ml; Size: 7.6 x 7.6 x 27.4 cm; Weight: 382g; Colours available: 2

3. Thermos Direct Drink Flask 470ml: Best flask for commuters

Price: £22 | Buy now from Argos

At the other end of the weight spectrum comes this gorgeous newcomer from Thermos, weighing in at barely more than 200g (before there’s anything in it, of course) and topped with a ‘direct drink’ spout that’s perfect for the train to work.

Thermos designed the flask to be as light and ergonomically comfortable as possible, with a cool sweat-proof exterior. It can’t match the Stanley Master for sheer insulating power (no flask can, to be honest) but it still does a great job of keeping cold drinks cold for a couple of days, and hot drinks piping hot all day.

The only downside if you’re not a fan of pink is that it only comes in one colour.

Key specs – Material: stainless steel (not officially dishwasher-safe); Capacity: 470ml; Size: 22 x 6.5 x 6.5cm; Weight: 210g; Colours available: 1

Buy now from Argos

4. SIGG Hot and Cold ONE: Best cheap durable flask for hikers

Price: From £20 | Buy now from Amazon

Drop it, dent it, dishwash it, drink straight from it, even brew tea in it. This fab lightweight flask is designed to survive anything, without messing with the temperature of its contents, keeping your brew comfortably hot for 12 hours.

The two-part locking lid doubles as a rotatable spout, so it’s ideal for taking a sip when you’re walking, although the plastic part of the lid does feel somewhat less durable than the metal. We also love the classic Sigg handle, which doubles as a lever so you can open it using a stick if your hands are cold or dirty. There’s even a built-in tea filter, so you can make tea using loose tea leaves or whatever you find on your adventures.

Key specs – Material: 18/8 stainless steel with polypropylene strainer (dishwasher-safe); Capacity: 500ml; Size: 25.5 x 6.9 x 6.9cm; Weight: 381g; Colours available: 3 (silver, white, black)

5. Hydro Flask Standard Mouth 21oz (600ml): Best sports flask

Price: £26 | Buy now from Amazon

Keep drinks cold in the blazing sunshine with this stylish, lightweight, double-wall insulated bottle, made from sturdy stainless steel and a powder-coating finish to stop it slipping out of sweaty hands. It does keep hot drinks hot for 12 hours, but it’s on summer adventures that this flask really comes into its own, keeping iced drinks cold for more than 24 hours.

Hydro Flask also comes in a smaller 12oz version and in a ‘wide mouth’ design, but only the standard mouth fits the insulated silicone Sport Cap (£9.50), designed for taking generous sips on the go.

Key specs – Material: 18/8 stainless steel (dishwasher-safe); Capacity: 600ml; Size: 26.5 x 7.3 x 7.3cm; Weight: 295g; Colours available: 3 (more colours available from other retailers)

6. Thermos King 1200ml: Best giant vacuum flask

Price: £24 | Buy now from Amazon

The Thermos King is surprisingly light given its size (it’s bigger than the Stanley Master but lighter and cheaper) and looks spectacular. Thoughtful details include a twist-and-pour stopper that lets you pour drinks without removing it, and a space-saving handle. However, it doesn’t insulate for as long as the Stanley Master, and it’s a bit drippy when pouring from the spout, at least when it’s full.

A Thermos King will last years but it’s not officially dishwasher-safe, and you’re not even meant to submerge it in water (if you do, you kill the manufacturer’s 50-year guarantee). Inquisitive users report that it does survive the dishwasher intact, albeit with peeling colour.

The pictured flask is in Cranberry Red; Argos also has it in Midnight Blue (£27.99). More colours and sizes are available from Thermos.

Key specs – Material: 18/8 stainless steel (not dishwasher-safe); Capacity: 1.2l; Size: 31 x 10.5 x 9.4cm; Weight: 670g; Colours available: 2 (more colours available from other retailers)

7. Thermos King Food Flask 470ml: Best all-around food flask

Price: From £19 | Buy now from Amazon

The King is back, and this time he’s full of lunch. Here, the Thermos’s insulated stainless steel lid doubles as a serving bowl, and comes with a full-size folding stainless steel spoon. Stews and soups stay very hot all day, while fruit and tubs of yoghurt stay cool all day – or fridge-cold if you include an ice pack in the flask. Ice cream won’t quite go the distance, but if you pack the flask with a handful of wrapped lollies straight from the fridge they’ll stay frozen for a few hours.

The pictured flask is Midnight Blue but Argos also has it in Red (pictured at the top of the page) for £18.99. Find more colours on the Thermos website.

Key specs – Material: 18/8 stainless steel (not officially dishwasher-safe); Capacity: 470ml; Size: 14.2 x 9.4 x 9.4cm; Weight: 390g; Colours available: 2 (more colours available from other retailers)

8. Lifeventure Wide Mouth Flask 1l: Best flask for sharing

Price: £21 | Buy now from Cotswold Outdoor

This large, robust flask comes with a removable shoulder strap, so you could throw it over your shoulder while you’re heading up a mountain for the weekend. And if you’re heading out there with a friend, even better, because there’s a second plastic ‘buddy cup’ hidden inside the larger metal one. The flask is wide enough to be used as an insulated lunchbox, too, but you’d need to bring your own spoon. Insulation is excellent, keeping contents piping hot for over 12 hours.

Key specs – Material: 18/8 stainless steel with copper coating (dishwasher-safe); Capacity: 1l; Size: 23 x 12 x 11.5cm; Weight: 708g; Colours available: 1

Buy now from Cotswold Outdoor

9. Black + Blum Food Flask: Most stylish food flask

Price: £22 | Buy now from Amazon

This vacuum-insulated flask from Black+Blum is a highly distinctive and eco-friendly option for keeping your food nice and warm. It has a capacity of 400ml and its leak-proof twist lid ensures that food and drink stay put, wherever you go. Once sealed, it can keep food hot for up to six hours, while boiling water will stay piping for ten or more. Meanwhile, cold food and drink will keep their cool for roughly eight hours. Finally, that colourful, ergonomic spoon stays fixed to the flask by slotting into the artificial leather strap, so you’ll never end up drinking your soup like tea.

2021 Top 10 VACUUM FLASK AMAZON HOT SELL

XIONGTAI VAUUM FLASK GROUP IS ONE OF THE LARGEST AND VERY PROFESSIONAL MANUFACTURER OF VACUUM FLASK.THEY OWN SEVERAL AUTOMATIC ROBOT PRODUCTION LINE TO PRODUCE VACUUM FLASK AND STAINLESS STEEL CONTAINER.

We are a professional supplier of amazon sellers and we are the long-term manufacturer and supplier of several amazon best sellers now.

1. Stanley Classic

2. Thermos “Mondial” vacuum insulated glass double wall flask, 1.8l

3. Thermo Café by Thermos stainless steel vacuum insulated multi-purpose flask, 1.8l

4. Hydroflask wide mouth flask

5. Red Original stainless steel bottle

6. Klean Kanteen TK Pro 750ml

Best Overall: Stanley Classic Flask

Best Splurge: Snow Peak Titanium Curve Flask

Best for Outdoors: GSI Outdoors Boulder Flask

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Best Value: Rabbit RBT Flask

Best for Sharing: High Camp Firelight Flask

Best for Whiskey: BruMate Liquor Canteen

Best Heavy-Duty: VSSL Wilderness Navigation Flask & Flashlight

Best Budget: Bormioli Rocco Pocket Flask

Best Design: Viski Summit Flask

Final Verdict

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The best flasks to buy

1. Stanley Master Vacuum Bottle 750ml: Best flask for keeping drinks hot and cold – for days

2. Contigo Autoseal Chill water bottle: Best flask for cold drinks

3. Thermos Direct Drink Flask 470ml: Best flask for commuters

4. SIGG Hot and Cold ONE: Best cheap durable flask for hikers

5. Hydro Flask Standard Mouth 21oz (600ml): Best sports flask

6. Thermos King 1200ml: Best giant vacuum flask

7. Thermos King Food Flask 470ml: Best all-around food flask

8. Lifeventure Wide Mouth Flask 1l: Best flask for sharing

9. Black + Blum Food Flask: Most stylish food flask