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The best hiking flasks: for hot drinks, soup and food during hikes and adventures

best flasks
(Image credit: Getty)

Forget skilled baristas serving flawlessly frothed cappuccinos at the perfect temperature. No tea, coffee or hot chocolate tastes better than one served piping hot on the summit of a wind-whipped hill or mountain. Ever. Which is why investing in the best hiking flasks makes perfect sense.

Ideally, your flask will keep drinks as scalding as molten lava, generate clouds of steam when you pour, and refresh and restore flagging spirits and limbs with the electrifying power of a Baptist preacher in full flow. Amen.

Even the most cursory glance at outdoor gear and camping websites reveals a wide range of insulated flasks vying to deliver your mid-walk pick-me-up. Short, tall, fat, thin, light, heavy, wide-mouthed or push-button lids, cups, handles… the choice seems endless to deliver the basic necessity of a hot drink (or hot food).

The question is simply to find the best hiking flask for you. Do you need a flask to serve a fresh-tasting brew on a summer’s stroll through a country park? Or are you relying on a flask to deliver some inner-warmth when you’re stood on a gale-lashed summit in mid-winter, or even to bring you back to life after an icy cold wild swimming experience?

Here’s our selection of the best hiking flasks for adventurers, wherever, whenever and however they’re embracing the outdoors. The one theme that unites them is their leak-proof construction – these are flasks robust enough to be carried in backpacks.

The best hiking flasks you can buy

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

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

Slender design 
Cap doubles as cup
Deep screw lid is leak-proof
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: Primus Vacuum Bottle 350ml

(Image credit: Primus)

Primus 350ml

Brighten up your drink stop with a colourful flask that ticks all performance boxes

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

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

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

(Image credit: Thermos)

Thermos Stainless King (470ml)

Feast on hot food during your walks with this top quality, wide-mouthed flask

RRP: £22 (UK) / $24 (US) | Volume: 470ml / 16fl 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

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

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

(Image credit: Stanley)

Stanley Classic 1.4L/1.5Qt

A huge flask with an iconic design and bombproof construction

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

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

GSI Outdoors Microlite 350 Flip

(Image credit: GSI)

GSI Outdoors Microlite 350

The flip-top lets you drink hot or cold liquids straight from the flask

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

Drink straight from the flask
Light, slender design
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.

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

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

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

Vango Magma Flask 500ml

(Image credit: Vango)

Vango Magma 500ml

A bargain price for a flask with first class performance

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

Great price
BPA-free cup
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.

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.

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 gloves when the temperature drops.

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 food 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.

Jonathan Manning

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.)