Buying guide
Flasks and Food Jars for Bonfire Night and Beyond
Drinks flasks versus wide-mouthed food jars, what size to buy, and how to keep soup and tea hot for longer.
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A good vacuum flask keeps tea hot at a bonfire, on a walk or at the match, and a wide-mouthed food jar does the same for soup or stew.
Our shortlist
Shortlist in progress
We only list products once their specifications have been checked against the manufacturer or retailer. Until then, use the criteria in this guide to compare what's available.
Where to buy
Browse current options and prices at the retailer. These are affiliate links: we may earn a commission, at no cost to you (disclosure).
Types
| Type | Best for | Notes |
|---|---|---|
| Drinks flask | Tea, coffee, hot chocolate | Narrow neck keeps heat in; a cup lid is handy |
| Food jar | Soup, stew, porridge | Wide mouth for spooning and cleaning |
| Travel mug | Drinks on the go | Keeps hot for a shorter time |
What to check
- Double-walled stainless steel vacuum insulation keeps heat best and does not break.
- Capacity: 500 ml for one person; 1 litre or more to share.
- Hot-hold claims: compare the maker's stated hours at a given temperature.
- Leak-proof seal and a lid that is easy to clean.
Keeping it hot
Fill the flask with boiling water for 5 minutes, empty it, then fill with piping hot food or drink to the top. Try Welsh leek soup or cock-a-leekie.
Frequently asked questions
How do I keep soup hot in a flask for longer?
Preheat the flask with boiling water for 5 minutes, then fill it right to the top with piping-hot soup. Less air means less heat loss.
Can I put milk in a flask?
Yes, but clean the flask thoroughly afterwards, as milk residue can sour and smell.
How long is hot food safe in a flask?
Eat it within the time the maker says the flask keeps food hot. If it has cooled to lukewarm, do not keep it for later.
How we choose
BeneRecipes compares tools using manufacturer specifications and retailer listings. We have not tested these products ourselves and don't publish star ratings. We explain which type suits which cook and why.
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