Best thermos flask 2021

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The 10 best thermos flasks to buy in the UK

The top 10 list of the best thermos flasks lists various brands and prices

Review10Best compares the best thermos flasks in the UK and selects the one by Thermos as the best thermos flask. In a thermos flask buying guide, you can read more about the features of the different thermos flasks and see a recommendation on which thermos flask to buy in the UK in 2021. By considering the top list of thermos flasks, you can find the best thermos flasks and save time shopping online.


Table of contents

  1. Read the ultimate thermos flask buying guide
  2. View the thermos flask picks and see how they rank in the top list

SEE THE TOP 10 LIST →
(skip buying guide)


Best thermos flasks: A complete buying guide

All you need to know before buying a great thermos flask

Picture of a thermos flask

The best thermos flask keeps beverages hot or cold for many hours, making it a great option for commuting, taking drinks to work, camping, hiking, and much more. However, many flasks are low quality and will not maintain the optimal temperature for long, so it helps to know what to look for to ensure you get the best thermos.

Check out the buying guide below for all the information you need to know to find the best thermos flasks:

What are thermos flasks?

A thermos flask, also called a vacuum flask, is a container designed to keep beverages hot or cold for prolonged periods. The design features an interior and exterior flask, with the double insulation creating a vacuumed atmosphere that maintains the beverage’s temperature by reducing heat loss.

Why should you buy a good thermos flask?

The best thermos flasks keep drinks hot for many hours, making it a great buy for anyone that enjoys coffee, tea, and other hot beverages. It can also maintain colder temperatures in drinks, preventing them from reaching room temperature, so it’s ideal for anyone that enjoys a refreshing cold drink. Being able to keep drinks both hot and cold makes a vacuum flask a great buy for many situations, such as taking drinks to work, outdoor excursions, or even just sitting in the house.

Another picture of a thermos flask
How to choose the right thermos flask?

Here are some things to consider when looking for the best vacuum flask:

  • Size: Flasks comes volume capacities ranging from 500ml to several litres, so you’ll want to consider how liquid it holds, choosing something that meets your daily needs. A large flask is great for people that drink lots of hot drinks throughout the day, such as taking a large flash of coffee to your work, while it’s useful for sharing. Smaller flasks have lower capacity but are lighter to carry and still great for individual use.
  • Materials: While the best thermos flasks are made from metals like stainless steel, some are made from glass. Providing it has the double insulation design, glass flasks can be just as good as their metal counterparts and provide a nice view of the drink inside, although they aren’t as durable and could break if you drop it.
  • Heat Retention: Always check how long the flask retains heat for, as some are better at this than others. Cheaper flasks tend to retain heat for 2-5 hours, while the best flasks can retain heat for upwards of 12 hours, although these will cost more and may not be necessary if you’re going to drink it sooner rather than later.
What is the best kind of thermos flask in the UK?

There are several types of best-selling thermos flasks available, any of which may be ideal for your needs. This includes:

  • Dual Flask: The standard thermos flask, it keeps drinks both hot and cold for a set period. It’s a versatile option for keeping drinks hotter or cooler for longer and is available in a range of sizes, from under a litre to several litres.
  • Food Jar: This type of flask is designed to hold foods like soup, stews, and pasta. They’re much the same as dual flasks but are usually designed to hold higher volumes. It can also be used to hold liquid so is a versatile option.
  • Infuser Flasks: The perfect flask for tea-lovers, it has a compartment for holding loose tea leaves to infuse with the hot water.
…are you ready for the best picks of 2021?

Top 10 list of thermos flasks in the UK (November 2021)

The bestseller list compares brands and their thermos flasks. Which thermos flask is the best?
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Best choice* TOP 1
Image of Thermos 183267 thermos flask
Thermos Stainless King Flask, Midnight Blue, 1.2 L, 183267*
  • 5 year guarantee, Made in China
  • Dimensions LxWxH:30.5 x 13 x 9 cm
  • Twist and pour stopper allows you to pour without removing the stopper
BUY NOW*
TOP 2
Image of Thermos 184807 thermos flask
Thermos 184807 Stainless King Food Flask, Red, 470 ml*
  • 5 year guarantee
  • Capacity: 470ml
  • Exterior remains cool with hot liquids and condensation free with cold
BUY NOW*
TOP 3
Image of STANLEY 6939236311472 thermos flask
Stanley Classic Legendary Bottle 1L / 1.1QT Hammertone Green - Stainless Steel Thermos Flask - BPA-free - Keeps 24 Hours Hot or Cold - Dishwasher Safe - Leak-proof Lid Serves As A Cup*
  • BUILT FOR LIFE: ‘Built for life’ is a motto Stanley stood by since 1913…
  • DISHWASHER SAFE: This thermos is designed to be cleaned easily; Every piece of this…
  • BPA-FREE STAINLESS STEEL: All contact surfaces are guaranteed to be safe and BPA-FREE;…
BUY NOW*
Offer* TOP 4
Image of Thermos 187011 thermos flask
Thermos 187011 ThermoCafé Stainless Steel Flask, Hammertone Grey, 500 ml*
  • Height 25cm
  • Keeps hot for up to 12 hours and cold for up to 24 hours
  • Insulated stainless steel cup
BUY NOW*
TOP 5
Image of Thermos 185198 thermos flask
Thermos 185198 Direct Drink Flask, Charcoal, 470 ml Black*
  • 5 year guarantee
  • Light and compact design for easy transportation and storage
  • Cool to the touch with hot liquids, sweat-proof with cold
BUY NOW*
TOP 6
Image of Thermos 181091 thermos flask
ThermoCafé Stainless Steel Flask, 1.0 L*
  • Insulated stainless steel serving cup. Capacity: 1.0L. Dimensions: 30cm x 9cm (Height…
  • Cool to the touch with hot liquids, sweat-proof with cold
  • Durable stainless steel interior and exterior
BUY NOW*
TOP 7
Image of Thermos 101514 thermos flask
Thermos 710 ml Stainless Steel King Food Flask, Red*
  • L x W x H: 9.4 x 9.4 x 18.3 cm
  • 5 year guarantee
  • Wide mouth is easy to fill, eat from and clean
BUY NOW*
TOP 8
Image of Thermos 185515 thermos flask
Thermos 185515 Light and Compact Flask, Midnight Blue, 1.0 L*
  • 5 year guarantee
  • Enhanced push button stopper for easy pouring
  • Cool to the touch with hot liquids and sweat-proof with cold
BUY NOW*
TOP 9
Image of Thermos 32180ASSTD thermos flask
Thermos Mondial Flask, 1.8 L - Black/Green/Blue Multicolour,32180ASSTD*
  • 3 assorted colours (1 shipped at random)
  • Meets and exceeds EN12546-1:2000
  • Keeps hot for 12 hours and cold for 24 hours
BUY NOW*
TOP 10
Image of Thermos 184804 thermos flask
Thermos Stainless King Flask, Red, 470 ml, 184804*
  • LxWxH: 7.6x7.6x24.4 cm
  • 5 year guarantee
  • Twist and Pour stopper lets you pour without removing the stopper
BUY NOW*
Affiliate Disclosure

* We participate in the Amazon Associates Program. As an Amazon Associate we earn from qualifying purchases. For the list of the best thermos flasks, we consider only products that are available on Amazon while the ranking is based on factors such as customer reviews, number of sales and keyword. It is not a thermos flask test. Last Update: 2021/11/27.