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Frequently Asked Questions

How long will a food flask keep soup hot?

Up to 15 hours on the best models in the range, and around 13 at the lower end, so check the product page for the one you are looking at. Two things help whichever you choose. Fill it to the top, because the air in the gap is what drains the heat, and rinse it through with boiling water before the food goes in.

Stanley 1913 Food Flasks & Food Jars

A food flask does something a lunch box cannot. It holds a temperature rather than slowing its decline, which is the difference between soup at one o'clock and lukewarm disappointment at one o'clock.

Vacuum insulated stainless steel, wide enough to eat straight from, and sealed tightly enough to travel on its side in a bag.

Soup Flasks

Soup is what most people buy one for, and it is the hardest thing to get right. The best models here hold food hot for up to 15 hours, which means the flask does not care when you filled it. Breakfast before a night shift, or the night before a long walk, and it is still hot when the lid comes off.

Chilli, stew, porridge, curry, dal, ramen. Anything you would rather eat hot than tepid works on the same principle.

Hot Food Flasks

The wide mouth is the detail that separates a food flask from a drinks flask. A spoon fits in properly, the last of it actually comes out, and it washes without needing a bottle brush. On many models the insulated lid unscrews to double as a cup.

Retention varies by model, so check the individual product page. The range runs from around 13 hours hot at the lower end to 15 at the top, with cold holds of 15 to 18 hours.

Insulated Food Jars, Hot or Cold

Vacuum insulation does not care which way the heat is trying to move, so the same jar that carries soup in February carries yoghurt, fruit, overnight oats or a chilled salad in July. One container, both jobs, and no second set of kit for summer.

Which Size?

The small sizes handle a side, a starter or a child's portion, and disappear into a bag with room to spare. The large ones take a proper main meal. If you are torn between two, the people who regret their choice are almost always the ones who went smaller.

Built for Life, Built to Last

18/8 stainless steel, BPA free and dishwasher safe. Some models in this range are made from recycled stainless steel, which is noted on the individual product pages. Nothing here has a plastic liner to cloud or peel, a seam to split, or a lid that stops sealing after a year in the dishwasher. That is the practical version of Built For Life, and it is why a jar bought now is still doing the job in a decade.

Complete Your Collection

A lunch box carries the jar and everything that travels with it, and the full insulated food container range lets you compare formats. Forks rather than spoons? Try a food bowl. For the drink, see flasks or water bottles, and ice packs handle the cold side.