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The best hiking flasks 2022: for keeping drinks, soup and food hot in the great outdoors

best flasks
(Image credit: Getty)

The best hiking flask enables you to take your favorite brew to some incredible places. Forget even the most artfully crafted barista coffee, by far the best coffee, tea or hot chocolate you'll ever taste is the one you enjoy on a snow-kissed mountain summit looking out across a sea of peaks. This we can guarantee.

If you're a lover of the outdoors, investing in the very best hiking flask is a great idea. Designed to maintain the temperature of their contents for several hours and usually featuring lids that double up as mugs, they're a boon to any camping or hiking trip. They particularly come into their own in the cold winter months.

Not only this, the best hiking flask options are incredibly robust and durable too. This is important for backcountry missions when your hiking backpack will have its fair share of scrapes with rock, ice and rough ground. Your flasks will undoubtedly have to be able to cope with a certain about of inadvertent abuse.

So, whether you're off summit seeking with your winter hiking boots or heading for a brisk wild swim with your friends, our selection of the best hiking flasks has got you covered. Cheers!

The best large hiking flasks

best hiking flask: Thermos Revival Flask

(Image credit: Thermos)

Thermos Revival Flask

A retro-themed Thermos flask that keeps your brew or stew reliably hot for over 18 hours (or cold drinks chilled for even longer)

Specifications

RRP: £30 (UK)
Volume: 530ml / 18.5 fl oz
Other available volumes: N/A
Weight (empty): 300g / 10.5oz
Height: 23.65cm / 9½ in
Lid-opening style: push button stopper
Colors: Blue tartan / Green tartan / Orange tartan

Reasons to buy

+
Very reliable at keeping fluids hot/cold
+
Cool classic look
+
Drip free pouring method
+
Cup screws on

Reasons to avoid

-
Only one cup
-
Cup is small

Part of the Revival range recently released by Thermos, these retro tartan 60s-chic flasks are direct replicas of the much-loved brand’s original Model 18 design, seen everywhere from family photos to Famous Five books for as long as anyone alive today can remember. With a heritage going back well over a century, Thermos flasks have been keeping people going in all sorts of outdoor scenarios for decades, reliably storing life-saving liquids (like hot tea and coffee) for hours on end, even in the most extreme conditions. And what adventure isn’t improved - or, indeed, made possible – by a steaming hot cuppa halfway along the trail or just below the top of the hill? 

The technology used in the Thermos (named after the Greek word for heat, Thérmé) stems from the invention the vacuum flask by Scottish scientist Sir James Dewar in 1892, when he was supposed to be working on cryogenics. This flask may look dated, by design, but it still works like a dream, keeping fluids hot for up to 18 hours and chilled for over 24 hours, while maintaining a neutral outside temperature so do don’t get any build up of condensation in your bag. The cup is quite small, but at least it screws securely to the top of the flask so it doesn’t become separated, and the system for opening and closing the main container is simple and functional. Classy, reliable and very functional - this a beauty of a flask that should last for many years.

Best flasks: Lifeventure TiV Vacuum Flask

(Image credit: Lifeventure)

Lifeventure TiV

A sleek and sturdy flask that keeps drinks hot for up to eight hours

Specifications

RRP: £20 (UK) / €25 (EU)
Volume: 700ml / 25.5fl oz
Other available volumes: 300ml; 500ml; 1-litre
Weight (empty): 445g / 15.7oz
Height: 28cm / 11in
Lid-opening style: Screw-in stopper
Colours: Black

Reasons to buy

+
Slender design 
+
Cap doubles as cup
+
Deep screw lid is leak-proof

Reasons to avoid

-
Have to remove stopper to pour

There’s a family of four sizes in the Lifeventure TiV range, so finding the volume of vacuum flask that suits your needs should be easy, from a small, solo flask to a mighty family-sized affair. Each TiV flask is copper-coated to boost heat retention, and should be good for keeping hot drinks hot for up to eight hours, while keeping cold drinks chilled for as long as 24 hours (tip: add ice cubes to extend the cooling effect).

The deep screw stopper provides a reassuringly leak-proof closure, but you’ll need to unscrew it completely to pour a drink. Out on the trail, the stainless steel lid doubles as a handy cup and is a useful size on all four flasks in the range, while the slim body makes it easy to pour single-handedly.

Best flask: Stanley Classic Vacuum Bottle 1.4L/1.5Qt

(Image credit: Stanley)
A huge flask with an iconic design and bombproof construction

Specifications

RRP: £50 (UK) / $88 (US)
Volume: 1.4L / 1.5Qt
Other available volumes: 470ml/16fl oz; 750ml/25fl oz; 1-litre/1.1Qt, 1.9-litre/2Qt
Weight (empty): 1kg / 33.8oz
Height: 35.8cm / 14in
Lid-opening style: Screw-in stopper
Colours: Hammertone green /Nightfall /Matte black

Reasons to buy

+
Super-tough build quality
+
Excellent insulation
+
Good-sized drink beaker

Reasons to avoid

-
Heavy
-
Handle can snag in a rucksack

The walker nominated to carry this giant flask in his or her rucksack has truly drawn the short straw… until the first drinks break… and the second… and the third! The great advantage of this double-wall vacuum insulation and the generous volume is that drinks stay unbelievably hot. Stanley claims a ‘stay hot’ time of 40 hours, and if you pack it with ice it will spend up to six days frozen!

On the other hand, it is a beast to carry, especially in a smaller day pack, and while the collapsible handle is useful for pouring when the flask is full, especially if you don’t have baseball mitts for hands, it can snag on clothes when you pull the flask out of a rucksack.

The fact that you’re as likely to see the Stanley Classic Vacuum Bottle on a building site as you are on a hilltop tells you everything you need to know about the flask’s bombproof build quality, which is reassuringly backed up by a lifetime warranty.

You’ll need a long brush to reach the bottom of the flask for cleaning, although it is dishwasher-proof – if your dishwasher is big enough to accommodate it!

Read our full Stanley Classic Vacuum Bottle review

Vango Magma Flask 500ml

(Image credit: Vango)
A bargain price for a flask with first class performance

Specifications

RRP: £10 (UK)
Volume: 500ml / 17fl oz
Other available volumes: 750ml/25.3fl oz; 1L/33.8fl oz
Weight (empty): 295g / 10.4oz
Height: 25.5cm / 10in
Lid-opening style: Screw-in stopper
Colours: Black

Reasons to buy

+
Great price
+
BPA-free cup

Reasons to avoid

-
Only available in black

Designed by camping and hiking specialist Vango, the stainless steel Magma Flask delivers everything a walker could want from a flask. Like Henry Ford’s proverbial Model T, you can choose any colour so long as it’s black, but that simplicity aside, the copper-coated double wall vacuum flask delivers impressive insulation to retain heat and keep cold drinks cool.

There’s no fancy lid – just unscrew the top and pour your cuppa into the lined cup.

The Vango Magma Flask is available in three sizes – 500ml, 750ml and 1-litre – so there’s a good range of choice from solo flask to family drinks, and all for bargain prices.

Read our full Vango Magma Flask review

The best small hiking flasks

Best flask: Primus Vacuum Bottle 350ml

(Image credit: Primus)
Brighten up your drink stop with a colourful flask that ticks all performance boxes

Specifications

RRP: £16.79 (UK) / €22 (EU)
Volume: 350ml / 11.8fl oz
Other available volumes: 500ml, 750ml, 1-litre
Weight (empty): 280g / 9.9oz
Height: 21cm / 8.3in
Lid-opening style: Click-close stopper
Colours: Pale blue / Leaf green / Black / Salmon pink / Melon pink

Reasons to buy

+
Fits in rucksack side pocket
+
Click-close stopper keeps in heat
+
Stainless steel doesn’t pick up flavours
+
Grippy powder-coated surface

Reasons to avoid

-
Narrow opening makes it harder to clean 
-
Fiddly to dismantle stopper for cleaning

The bright colours of the Primus Vacuum Bottle range are, er, not just a pretty face on a functional item of outdoor kit. The powder coating gives enough purchase that it’s possible to unscrew the lid without taking off your gloves, which is a massive bonus when the mercury tumbles. Then it’s simply a question of pushing down the button in the centre of the stopper and pouring your drink. It’s not the neatest spout, and is far from ideal if you fancy swigging cold drinks directly from the flask, but on the plus side it traps heat inside to keep drinks warmer for longer. This ‘sealed’ stopper also makes it a little harder to assess how much drink is left in the Primus Vacuum Bottle – walkers will have to count the cupfuls they pour to keep track.

The lid serves as a handy cup, although as with most flasks in this review, the volume is pretty small, especially if you’re accustomed to the giant beakers of high street coffee outlets.

After use, the narrow opening makes cleaning a little difficult, particularly if you take milk in your coffee or fill the flask with soup, although long brushes are available. The click-close button also disassembles for cleaning, but it’s far from obvious how to do this.

Read our full Primus Vacuum Bottle 350ml review

Best flask: Thermos Stainless King Food Flask (470ml)

(Image credit: Thermos)
Feast on hot food during your walks with this top quality, wide-mouthed flask

Specifications

RRP: £22 (UK) / $24 (US)
Volume: 470ml / 16fl oz
Other available sizes: 710ml / 24fl oz; 1.2L / 40.5fl oz
Weight (empty): 380g / 13.4oz
Height: 14.2cm / 5.6in
Lid-opening style: Screw-in stopper
Colours: Matt black / Midnight blue / Red / Copper / Gun metal / Duck egg / Raspberry / Matt black & gold

Reasons to buy

+
Folding spoon in lid
+
Insulated lid serves as a bowl
+
Excellent insulation
+
Easy access to eat from the pot
+
Easy to clean

Reasons to avoid

-
Not ideal for drinks
-
Squat dimensions

If there’s one thing more likely to turn your walking buddies green with envy than having a flask of hot drink available throughout the day, it’s tucking into a hot meal while they chomp on soggy sandwiches. Pasta with pesto and cheese, chunky soups and hearty stews… whatever your midday masterpiece, this robust Thermos Stainless King Food Flask will keep it hot until it’s time for lunch.

The flask itself is short and fat, its 9.4cm diameter too wide to slide into a side pocket of a rucksack, but at only 14.2cm tall it squeezes inside a pack with no trouble. The lid conceals a handy, full-size folding spoon and you could use the insulated lid as a bowl if you’re sharing your meal, although most walkers should be able to manage the full contents on their own.

Thermos claims that once sealed, the Stainless King Food Flask will keep hot food hot for nine hours and cold food chilled for 14 hours. For optimum performance it pays to pre-heat the flask with boiling water prior to filling it with food, and once the wide lid is removed it doesn’t take long for an icy wind to cool food down.

The wide mouth does, however, make this pot easy to clean – only larger hands won’t fit inside it, and the five-year guarantee is a welcome case of a manufacturer putting its money where its mouth is.

Read our full Thermos Stainless King Food Flask review

GSI Outdoors Microlite 350 Flip

(Image credit: GSI)
The flip-top lets you drink hot or cold liquids straight from the flask

Specifications

RRP: £28 (UK) / $25 (US)
Volume: 350ml /12fl oz
Other available volumes: 500ml/17fl oz; 720ml/24fl oz
Weight (empty): 200g / 7oz
Height: 18cm / 7.1in
Lid-opening style: Flip top
Colours: White, Black / Fuchsia / Red / Sky blue

Reasons to buy

+
Drink straight from the flask
+
Light, slender design

Reasons to avoid

-
You may need to carry a mug if your drink is too hot to swallow straight from the flask

The slim, stylish GSI Outdoors Microlite 350 Flip applies the spout technology of a water bottle to the science of keeping drinks kettle hot or ice cube cold. The flip-top lid and pouring spout lets you swig straight from the flask, which is ideal unless your drink is too hot to swallow (and watch out for your fillings if you’ve packed the bottle with ice). You can, of course, simply take a mug along with you (there’s no lid cup on the top, unlike the other flasks in this test), and if you want a flask to double up for your commutes it’s easy to have a mug ready on your desk at work.

The ultra-thin, 2mm walls of the flask lend it the slenderness of a supermodel while swallowing a surprisingly large volume of fluid given its dimensions – GSI reckons it can carry 25 percent more liquid than traditional vacuum bottles of the same size.

The push-button, flip-top cap allows one-handed access, which is convenient if you’ve got a map, GPS, camera or walking pole in your other hand.

As for the insulation, the Microlite 350 Flip will keep hot drinks hot for eight hours and keep cold drinks chilled for as long as 16 hours.

Read our full GSI Outdoors Microlite 350 Flip review

Camelbak Hot Cap SST Vacuum Insulated 355ml/12oz

(Image credit: Camelbak)

Camelbak Hot Cap SST Vacuum Insulated 355ml/12oz

A travel mug with a lid so secure that it works as a flask, too

Specifications

RRP: £27 (UK) / $23 (US) / €23,38 (EU)
Volume: 355ml / 12oz
Other available sizes: 600ml / 21fl oz
Weight (empty): 244g / 8.6oz
Height: 15.6cm / 6.1in
Lid-opening style: Twist valve
Colours: Black / Moss / Navy / White / Blue grey / Plum

Reasons to buy

+
Drink straight from the flask
+
BPA, BPS, and BPF free
+
Easy to clean

Reasons to avoid

-
No mug

While insulated travel mugs offer a far greener alternative to disposable coffee shop beakers, suspicions about the security of their seals have left walkers reticent about trusting them beyond campsite use. As scores of positive reviews attest, however, Camelbak has solved the problem thanks to its Hot Cap, which converts insulated mugs and bottles into flasks. Cleverly, the Hot Cap is also compatible with Camelbak’s Chute Mag and Eddy+ water bottles, turning them into cold drink flasks.

The lid’s rotating twist valve opens and closes the flow of liquid, with the added convenience of 360-degree drinking from any side of the mug (handy for keeping your eyes on the road if you’re taking a swig while driving).

Out on the trail, the no-slip textured flask fits nicely in the hand, keeps hot drinks hot for six hours (a much better performance than most travel mugs), and then is straightforward to disassemble for a thorough clean.

Hiking flask comparison table
FlaskPriceWeightVolumeOther available sizes
Thermos Revival Flask£30 (UK)300g / 10.5oz530ml / 18.5 fl ozNone
Lifeventure TiV£20 (UK) / €25 (EU)445g / 15.7oz700ml / 25.5fl oz300ml; 500ml; 1L
Stanley Classic 1.4L/1.5Qt£50 (UK) / $88 (US)1kg / 33.8oz1.4L / 1.5Qt470ml/16fl oz; 750ml/25fl oz; 1-litre/1.1Qt, 1.9-litre/2Qt
Vango Magma 500ml£10 (UK)295g / 10.4oz500ml / 17fl oz750ml/25.3fl oz; 1L/33.8fl oz
Primus 350ml£16.79 (UK) / €22 (EU)280g / 9.9oz350ml / 11.8fl oz500ml, 750ml, 1-litre
Thermos Stainless King (470ml)£22 (UK) / $24 (US)380g / 13.4oz470ml / 16fl oz710ml / 24fl oz; 1.2L / 40.5fl oz
GSI Outdoors Microlite 350£28 (UK) / $25 (US)200g / 7oz350ml /12fl oz500ml/17fl oz; 720ml/24fl oz
Camelbak Hot Cap SST Vacuum Insulated 355ml/12oz£27 (UK) / $23 (US) / €23,38 (EU)244g / 8.6oz355ml/12oz600ml / 21fl oz

Choosing the best hiking flask for your outdoor adventures

Volume

This is an entirely personal decision – are you carrying a hot drink only for yourself, for you and a partner, or for the whole family? For coffee lovers weaned on the giant beakers of Starbucks and Costa, the 350ml, one-person models may not be turn out to be the best hiking flask for a long day in the hills. Of course, the more liquid you carry, the more weight you carry in your daypack.

Dimensions

Where will you carry your flask? Tucked deep in your rucksack or in a side pocket for swift, easy access. The diameter of some of the best hiking flasks in this test is too wide to slide into many daypack side pockets. It’s also worth bearing in mind that a flask which fits snugly in your hand is easier to pour and avoids having to take off your hiking gloves when the temperature drops.

best hiking flask: Thermos Revival

They'll see you coming a mile off (Image credit: Pat Kinsella)

Top/stopper

The traditional, deep, screw-in stoppers should provide the most secure seal (although most modern flasks are reliable), but they need two hands to unscrew and pour, and they let heat escape each time they are undone. Click tops that let you pour a drink without unscrewing the top retain heat better, but they don’t let soup flow very easily and they can be awkward to dismantle and clean. Drinking spouts that allow you to drink straight from the flask seem convenient, but if the flask’s insulation is any good the drink will be too hot to swallow for a long time.

Opening

If you want to use your flask for hot camping meals you’ll need a wider mouth and shallower depth to reach the bottom with a fork or spoon. The wider mouth makes cleaning easier because most people will be able to squeeze a hand and scourer inside.

Insulation

The primary reason for taking the best hiking flasks on a walk is to keep hot drinks hot or chilled drinks cold, so their insulation performance really matters. Pre-heating or pre-cooling flasks can make a significant difference to the heat/cold retention. Remember, too, that the more liquid in a flask the better it will retain its temperature, so larger volume flasks will outperform smaller rivals.

After spending a decade as editor of Country Walking, the UK’s biggest-selling walking magazine, Jonathan moved to edit Outdoor Fitness magazine, adding adrenaline to his adventures and expeditions. He has hiked stages or completed all of the UK's national trails, but was once overtaken by three Smurfs, a cross-dressing Little Bo Peep, and a pair of Teletubbies on an ascent of Snowdon. (Turns out they were soldiers on a fundraising mission.)

With contributions from