Bag cooking (pack cooking): Japan's one-pot method for power outages and camp
Japan's Ministry of Agriculture, Forestry and Fisheries (MAFF) recommends a disaster cooking method called pack cooking (パッククッキング): put food in a heat-resistant plastic bag and simmer the bag in a pot of water. MAFF describes it as a way to make a simple meal even when gas, water and electricity are cut off. All you need is a cassette stove (or a camp stove, outdoors), a pot, water and the right bags.
Why it works
- Flavor stays in the bag: the ingredients keep their taste and savoriness.
- Hygienic and portable: the food is sealed from start to finish.
- Almost no washing up: serve from the bag onto a plate, and the pot and dishes stay clean.
- Several dishes at once (our note): rice in one bag and vegetables in another can share one pot, as long as each bag is one or two servings and the pot has room.
MAFF's guide also suggests related tricks for when water is scarce: line plates with plastic wrap, use kitchen scissors instead of a cutting board, and mix ingredients inside a food bag instead of a bowl.
Six steps (from MAFF's guide)
- Put the food and seasoning in the bag and push out the air, using water pressure (lower the bag into a bowl of water).
- Tie the bag high up, since it puffs up when heated.
- Spread the food flat so it heats evenly.
- Simmer in the pot.
- Lift the bag out with a slotted ladle or tongs.
- Cut the knot and serve it on a plate.
Choosing bags
MAFF's guide lists food bags "heat-resistant to 130°C or higher, suitable for simmering" as something to stock, and its cooking page specifies high-density polyethylene bags labeled for boiling. A Kanagawa Prefecture leaflet gives the same two criteria. Thin grocery bags and generic plastic bags are not the same thing. Always check the packaging for material, heat rating and intended use.
Safety points
| Point | Source |
|---|---|
| One to two servings per bag | MAFF |
| Put a heat-proof plate or cloth on the bottom of the pot so bags don't touch the hot base and tear | MAFF; Kanagawa |
| Use a pot with plenty of room for the amount of food | MAFF |
| Keep the knot from hanging over the edge of the pot | Kanagawa |
| Oily foods are a poor fit; they can also cause bags to tear | Kanagawa |
| Watch for burns when putting bags in and taking them out | MAFF |
| Cook food through; Japan's health ministry uses 75°C at the center for at least 1 minute as its guide for heating | MHLW |
What to cook first (our suggestions)
- Squash or potatoes: forgiving and easy to judge, the same dish MAFF uses in its photos.
- Rice: rice and water in one bag; practice the timing at home before you rely on it.
- Canned fish with vegetables: canned food is already cooked, so the bag only needs heating through.
Practice on a camping trip so you learn the timing before you ever need it. If you cook on a camp stove, do it outdoors; see carbon monoxide at camp.
Everyday
Try it at camp or at home: rice in one bag, vegetables in another, all in one pot of water.
When it counts
With the gas or water off, a cassette stove, a pot and a few bags still make a hot meal with almost no washing up.
Sources and when we checked them
- MAFF (Japan), Disaster Food Stockpile Guide, ch. 8 (in Japanese) (checked 2026-10-31)
- MAFF, Food stockpile guide for people needing special care, p. 8 (PDF, in Japanese) (checked 2026-10-31)
- MAFF, same guide, p. 4 (PDF, in Japanese) (checked 2026-10-31)
- Kanagawa Prefecture, pack cooking leaflet (PDF, in Japanese) (checked 2026-10-31)
- Ministry of Health, Labour and Welfare of Japan, preventing food poisoning at home (in Japanese) (checked 2026-10-31)
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