In this guide we’ll look at the best thermos flasks.
We’ve compared design, capacity, cool features and cost
to give you our top recommendations.

What Is the Best Thermos Flask?

IMAGERECOMMENDED PRODUCTSPRODUCTFEATURES
  • Included serving cup
  • 1.2L capacity
  • Twist and pour stopper
  • 470ml capacity
  • Range of colours available
  • Includes serving bowl lid and spoon
  • 470ml capacity
  • Very easy to clean
  • 50 year guarantee
  • Very cute design
  • Great for packed lunches
  • Very easy to clean
  • BPA free
  • Cool to the touch
  • Available in 2 different sizes

More Detailed Thermos Flask Reviews

Thermos Stainless King Flask

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FEATURES
  • Included serving cup
  • 1.2L capacity
  • Twist and pour stopper
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Thermos Stainless King Flask Review

The Thermos Stainless King Flask is the best thermos flask for the UK market, thanks to its durability, quality and range of colours available – including Midnight Blue, Cranberry and Duck Egg.

This lovely flask has thermos vacuum insulation technology for maximum temperature retention, keeping your drinks or soups hot for 24 hours, or cold for 24 hours! Perfect for travel or outdoor adventures.

Made from durable stainless steel, sweat proof and cool to touch, this is a well deserving winner of the best thermos flask. It has a twist and pour stopper to prevent spillage and comes with a serving cup. The 1.2L capacity means you’ll have enough to drink while keeping the flask lightweight, and it comes with an incredible 50 year guarantee.

Thermos Stainless King Food Flask

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FEATURES
  • 470ml capacity
  • Range of colours available
  • Includes serving bowl lid and spoon
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Thermos Stainless King Food Flask Review

The Thermos Stainless King Food Flask is a strong contender for the best thermos flask for soup award! Choose from 8 lovely colours and enjoy hot drinks and soups for up to 9 hours. It’ll also keep contents cold for 14 hours.

This has been made from durable stainless steel and comes with an insulated lid that can double up as a serving bowl. It’s cool to the touch, no matter how hot the contents, and sweat proof with the cold.

Perfect for soup, this comes with an extra wide mouth and full size folding stainless steel spoon – ideal for camping trips. The 50 year guarantee is a testament to its quality!

Thermos Stainless King Travel Tumbler

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FEATURES
  • 470ml capacity
  • Very easy to clean
  • 50 year guarantee
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Thermos Stainless King Travel Tumbler Review

The Thermos Stainless King Travel Tumbler is the best small thermos flask on the market today, with a 470ml capacity, or around 2 cups of tea or coffee. This awesome little flask is made from stainless steel and comes in a selection of colours, including Gun Metal, Raspberry and Metallic Blue.

Featuring a drinklock sealing lid, this thermos flask is safe to carry in your bag on hikes or outdoor adventures. It keeps drinks hot for 7 hours, or in hot weather will keep the contents cold for 18 hours. It’s extremely lightweight so great for carrying around, and it’s very easy to clean.

Thermos FUNtainer Food Flask

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FEATURES
  • Very cute design
  • Great for packed lunches
  • Very easy to clean
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Thermos FUNtainer Food Flask Review

The Thermos FUNtainer Food Flask is the perfect flask for outdoor adventures, hiking or even just a packed lunch! This cute and compact thermos flask comes in a choice of 4 designs, including Pink, Floral or Football!

With an extra wide mouth that’s easy to fill, clean and eat from, this flask will be loved by kids and adults alike. It keeps food hot for up to 5 hours, or cold for 7 hours – so great for soup, noodles or salads.

With a capacity of 290ml but with a compact height of just 12cm, this is easy to carry in your bag and taking on the go. It’s very durable, and comes with a 5 year guarantee for peace of mind.

Thermos ThermoCafe Stainless Steel Flask

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FEATURES
  • BPA free
  • Cool to the touch
  • Available in 2 different sizes
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Thermos ThermoCafe Stainless Steel Flask Review

The best thermos flask for keeping drinks hot has got to be the ThermoCafe Stainless Steel Flask. This ever-popular flask comes in a choice of 0.5L or 1L capacity, and it has a durable stainless steel interior and exterior.

Ideal for camping trips or long journeys, this thermos flask stays cool to the touch, no matter how hot the contents. It slots easily into a backpack or handbag, and has a twist and pour stopper so you don’t need to take the stopper fully off and risk losing it.

With the lid doubling up as a serving up, and a weight of just 300g, this thermos flask is a must-have item for any outdoor enthusiast.

Thermos Flask Buyer’s Guide

Whether you’re heading out on an adventure into the wilderness or fancy a hot coffee for your train journey into work, a thermos flask is an essential. Investing in a thermos flask will save you money on coffee while you’re out and about, and they’ll keep your drinks either hot or cool for up to 24 hours. They can even be used for taking your packed lunch into work!

The best thermos flask for you can be tricky to find, as there’s such an enormous range on the market today. Not sure what to look for when it comes to the best thermos flask? This buyer’s guide will tell you what’s what.

Design

What you plan on using your thermos flask for will determine the design you opt for. If you’ll be taking it on hikes or camping trips, it should slot easily and neatly into your bag without bulking it out. If you’re going to be using it while travelling or on the train, it should be easy and comfortable to carry by hand.

The classic cylinder design is perfect for hot teas and coffees, while smaller thermos flasks with a wide opening are great for soups and other foods – as this makes them easier to eat from and clean.

Capacity

Flasks can range from around 300ml to over 1L! Remember that the more you fill your flask and the larger it is, the heavier it’ll be to carry. If you are using the flask for long distance journeys you’ll want one with a larger capacity (so more room for coffee!), while your mid-morning brew at work can fit in a much smaller flask.

Purpose

There’s a range of reasons to buy a thermos flask. If you’re going camping and want a hot drink in the evening, a large flask that fits neatly into your bag is perfect. Go for one with extra insulation to ensure your drink stays hot for as long as possible. The twist and pour opening is good for the outdoors, as you won’t be in danger of losing anything and the lid will double up as a cup.

For food, a small, compact thermos flask with a large opening is ideal. This makes them easy to clean, and they can usually fit a deceptive amount of soup or hard food! Look for one with an included bowl or serving spoon if you won’t have access to these.

Cool Features

It’s essential that your thermos flask stays cool no matter how hot the contents. The best thermos flask will keep the contents hot while staying cool to the touch. This means you can pack it away in your bag or carry it without any chance of getting burned.

Thermos flasks aren’t just a winter product. They will also keep any food or drinks cool for up to 24 hours, making them ideal for carrying cold water, or cold foods on hot summer walks. Unlike regular water bottles they can be left in the sun (although please try not to do this!), without any risk of the contents going warm.

Material

Most thermos flasks are made from stainless steel which is durable, easy to clean and very good at retaining heat. Plastic thermos flasks are available and usually cost a lot less, but these don’t retain heat quite so well and certainly won’t last as long. You’ll pay more upfront for stainless steel but it’s a much more reliable option.

Lid

Ensure the lid of your thermos flask is secure and effective. There should be no leaks, and it should loosen and tighten easily. Screw caps are the best option as they are most likely to stay on, but check reviews before you buy. The best thermos flask will have a lid which doubles up as a cup or bowl, so you don’t have to carry one separately.

FAQ

How does a thermos flask work? 

Thermos flasks are simple inventions that work using insulation. They have a stainless steel case, and usually an inner layer of stainless steel. The air between the 2 layers is sucked out creating a vacuum. As heat is transferred through air, the vacuum stops air from transferring – keeping your food and drinks hot. Heat is also preventing from reaching the inside due to the vacuum, meaning your cold drinks will stay cold no matter how hot it is outside.

How to clean a thermos flask?

Thermos flasks are usually pretty easy to clean, but they must be cleaned after every use. Do not put them in the dishwasher. Instead, use warm water and washing up liquid to clean your flask, rinsing thoroughly with hot water. To remove coffee stains, add a teaspoon of bicarbonate of soda and fill with hot water. Leave this solution overnight then rinse a couple of times.

Conclusion

When it comes to the best thermos flask, it’s got to be the Thermos Stainless King Flask that claims the top spot. Keeping contents either cool or hot for 24 hours, it’s the perfect choice for outdoor adventures or trips away. Meanwhile the lovely design and range of finishes makes it equally suitable for day to day use.

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