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The 10 best thermos flasks to buy in the UK

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.

How to choose the right thermos flask in 2024?

Another picture of a 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.

Top 10 list of thermos flasks in the UK (2024)

The bestseller list compares brands and their thermos flasks. Which thermos flask is the best?
Best choice TOP 1
Image of THERMOS 181109 thermos flask
Thermos Thermo Cafe S/S Flask - 181109, Silver, 0.5 Litre
  • Insulated stainless steel serving cup and not dishwasher safe
  • Cool to the touch with hot liquids, sweat-proof with cold
  • Durable stainless steel interior and exterior
Image of Thermos 183267 thermos flask
Thermos Stainless King Flask, glossy black, 1.2 L, 33.6 x 11.99 x…
  • Dimensions: 30.5 x 13 x 9 cm
  • 5 year guarantee, Made in china
  • Twist and pour stopper allows you to pour without removing the stopper
Offer TOP 3
Image of ThermoCafé by Thermos 170694 thermos flask
THERMOcafé by THERMOS Stainless Steel Flask, Hammertone Blue,…
  • BPA free
  • Insulated stainless steel serving cup
  • Cool to the touch with hot liquids, sweat-proof with cold
Image of Thermos 184807 thermos flask
Thermos 184807 Stainless King Food Flask, Cranberry Red, 0.47 L
  • 5 year guarantee
  • Capacity: 470ml
  • Exterior remains cool with hot liquids and condensation free with cold
Image of Thermos 184804 thermos flask
Thermos Stainless King Flask, Red, , Cranberry Red, 0.47 L
  • Easy to clean, just use warm soapy water.
  • Easy pour lid makes this a practical yet easy-to-use piece of your kit.
  • Offers Thermos' excellent temperature retention technology.
Image of Thermos 185198 thermos flask
Thermos 185198 Direct Drink Flask, Charcoal, 470 ml, Stainless Steel,…
  • 5 year guarantee
  • Light and compact design for easy transportation and storage
  • Cool to the touch with hot liquids, sweat-proof with cold
Image of Thermos 185511 thermos flask
Thermos 185511 Light and Compact Flask, Midnight Blue, 500 ml
  • Keeps hot for up to 24 hours and cold for up to 24 hours
  • Innovative push button stopper for easy pouring
  • Light and compact design allows larger capacity in a smaller bottle
Image of Thermos 32100ASSTD thermos flask
Thermos Mondial Flask, 1L
  • Meets and exceeds EN12546-1:2000
  • Keeps hot for 12 hours and cold for 24 hours
  • With stash top compartment
Image of Thermos 171708 thermos flask
Thermos Flask, Stainless Steel, Matt Black, 470 ml
  • Easy to open, push-button lid with locking catch so you can drink directly from the…
  • Cool to the touch with hot liquids, seat-proof with cold
  • Durable stainless steel interior and exterior
TOP 10
Image of IOZY IOZY-9011 thermos flask
Flask for Hot Drink Large 2L Thermo Flask Triple-Walled Vacuum Insulated,…
  • 100% SATISFACTIONAll our products are fully tested and inspected before we ship them…
  • EASY CARE & CARRYWide-mouth allows easy access to clean inner tube of the flask…
  • BUDGET-FRIENDLYOur flask has a capacity of 2L / 68oz which can meet the needs of…
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