Long-term food storage in the UK: mylar bags, buckets or tins?

The short answer for UK homes

Searches for mylar bags, food storage buckets and "25 year shelf life" food have grown fast. Most of that advice is written for American homes. For a normal UK household, it is usually more than you need.

The UK government's Be Ready campaign asks you to keep food for a few days that has a long shelf life and needs no fridge and no cooking. Its examples are tinned meat, fish or vegetables, dried fruit and nuts. It says it's best to buy food you'd usually eat, and to check expiry dates every six months.

That means tins and packets you already buy, kept in a cupboard and used in turn. If you want more cover, a week or two of the same foods is a calm next step. See our 7-day no-cook food box and two weeks of supplies.

How mylar bags and oxygen absorbers work

Mylar-type bags are pouches with a foil layer. The foil keeps out light, moisture and air much better than a normal plastic bag.

An oxygen absorber is a small sachet you seal inside the bag. Utah State University Extension explains it simply: air is about 78% nitrogen and 21% oxygen. If the absorber takes up the oxygen, what is left is about 99% nitrogen in a partial vacuum.

Why this helps:

• Less oxygen means slower spoiling. USU Extension says oxygen causes chemical changes in stored food, and that dried beans keep better with the oxygen removed.
• Insects can't survive. For wheat, USU Extension says an oxygen-free pack kills adult insects and stops larvae from surviving.
• Buckets alone don't hold it. USU Extension says plastic buckets and polyethylene bags will not keep an oxygen-free space after treatment, because oxygen gets back in over time. This is why people put sealed mylar bags inside buckets. The bucket protects the bag; the bag does the work.

Which foods suit it, and which don't

The safety rule first. USU Extension warns that botulism poisoning can happen if moist foods are stored in packaging that reduces oxygen. Foods sealed with oxygen absorbers must be dry: about 10% moisture or less.

Foods that suit long-term dry packing, from USU Extension's guidance:

Foods that don't suit it:

• Anything moist. Fresh, cooked or soft foods must never go into an oxygen-free pack. That is the botulism risk.
• Oily or fatty foods. USU Extension notes that oxygen makes bean oils go rancid, and it advises filling sealed bottles only with foods low in moisture and oil. Nuts, oily seeds and similar foods won't keep for years even in mylar.

Temperature matters most. USU Extension says that, according to USDA, shelf life halves for about every 10.8°F (6°C) rise in temperature. It suggests a steady, cool store. A warm loft or a shed that heats up in summer will cut those "25 year" figures a lot.

Where "one-year" and "25-year" lists come from

Most "food storage list for 1 year" PDFs come from the United States. Long-term home storage is common there, especially in Utah, which is why so much of the research comes from Utah State University. These lists lean on bulk dry staples: wheat, white rice, oats and beans.

Even there, the advice is to start small. One of the best-known US home-storage programmes, run by The Church of Jesus Christ of Latter-day Saints, says to store foods that are part of your normal diet, build from a week to a month and then three months, and not to go into debt to do it all at once.

For a UK home, a year of wheat and beans you don't normally cook is rarely useful. It takes space, money and kit to prepare.

Tins, dates and rotation

GOV.UK guidance on food labels explains the two dates:

• Use by is about safety. Food can make you ill after this date.
• Best before is about quality. After it, food is usually safe but may not be as good. Tinned foods carry best before dates.

The bigger risk with any stockpile is waste. WRAP, the UK waste charity, says 4.7 million tonnes of food that could have been eaten is thrown away each year, and 60% of UK food waste happens in homes. Buying food you'd normally eat, and using the oldest first, avoids adding to it. Our guide to stock rotation shows how, and the emergency food list gives ideas.

If you still want to try mylar

That is fine as a hobby or for a longer store. Keep it simple:

1. Use only dry, low-fat foods, such as white rice or dried beans.
2. Use food-safe oxygen absorbers sized for the bag, as the maker says.
3. Seal well, label with the food and date, and keep in a cool, dark place.
4. Put bags in a bucket or tub to protect them from damage and pests.
5. Keep your everyday tins as your first layer. They are easier to use in a power cut. Use the emergency supplies calculator to size it.

Related guides

• Stock rotation at home: first in, first out
• UK stockpile shopping list: the Be Ready list, aisle by aisle
• Two weeks of emergency supplies: a sensible extended plan

Free tools

• Emergency supplies calculator (water and food for your household)
• Compare emergency food options

We're an independent UK site, not the government. We check guides against official sources and link to them. In an emergency call 999.

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