Five of the best vacuum flasks

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1. Thermos King Food Flask

This 470ml Thermos has vacuum insulation that will keep food hot for nine hours and cold for 14. It is made from durable stainless steel, has an insulated lid that doubles as a bowl, and comes with a stainless-steel folding spoon that slots into the cap

£25; johnlewis.com

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2. S’well Traveler 12oz Water Bottle

Short and stout with a triple layer of insulation, this bottle keeps drinks chilled for 24 hours and hot for 12. It has a volume of 470ml and comes in a range of designs.

£34; revolve.com

3. Thermos Mondial Flask

Great for longer outings, this affordable flask holds 1.8 litres of liquid and comes with two cups on the lid, so you can pour a cup for a friend too. It promises to keep liquids hot for 12 hours and cold for 24.

£18; argos.co.uk

4. 720°DGREE Thermo Food Flask wunderJar

This chunky container is slightly more compact at 450ml, but that should still be enough for two meals. It keeps food hot for up to nine hours (or cold for 16 hours) and is BPA free.

£26; amazon.co.uk

5. Black + Blum Food Flask

This elegant flask would make a great container for lunches at the office. It is made from stainless steel, will keep food hot for six hours or cold for eight. It comes with a ladle-like spoon that’s great for soup.

£25.50; bodykind.com