Vacuum storage bags for futons and winter clothes: is there anything I should not put in them?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Vacuum storage bags (圧縮袋, asshuku-bukuro), which you flatten with a vacuum cleaner or by rolling, have long been a fixture in Japan's small homes because they free up space in the oshiire (押し入れ, the deep built-in closet). But they also cause plenty of grief: "My down futon never fluffed back up", "My down jacket is flat", "Six months later: creases and mould". What can go in depends on the material and how long it stays there.
What can and cannot be compressed
| Item | Compress? | Reason and notes |
|---|---|---|
| Polyester-fibre futons and blankets | Yes | Recover well. Take out and air within 6 months |
| Cotton clothing (T-shirts, sweatshirts) | Yes | Will crease. Air or iron after taking out |
| Down futons | Avoid, or squeeze out only a little air | The barbs of the down break and the loft (warmth) does not return. The Japan Down Products Cooperative Association also advises against heavy compression |
| Down jackets | Avoid | As above. Store in a roomy non-woven cover instead |
| Wool and cashmere knits | Avoid, or short-term only | Broken fibres and creases; moth repellents work differently in a sealed bag |
| Leather and synthetic leather | No | Fold marks, cracking, surface damage |
| Memory foam and urethane products | No | Do not recover; the material breaks down |
| Anything damp or unwashed | No | Seals in mould and smells and lets them grow |
- How far to compress: down to about one third of the volume. Sucking it "flat as a pancake" causes severe fibre breakage and creasing. Fill the bag no more than 80%; overfilling is the main cause of splits.
- Before it goes in: wash, then dry completely. Leftover skin oil and moisture breed mould and insects. If you put a moth repellent in a vacuum bag, use one labelled for vacuum bags (圧縮袋対応). Most repellents work by evaporating; in a sealed bag they may not work as designed, or the active ingredient may build up on the fabric.
- Duration: take things out and air them once every six months. Most vacuum bags are not a perfect seal and let in some air within a few months. Leaving items for over a year is the main cause of creases, mould and smells.
- After taking out: half a day to a day in the sun or in the shade to let the air back in. Polyester fibre recovers with a light beating. Down does not recover easily.
- Alternatives: put down, feathers and knits in non-woven cases or breathable storage bags, filled no more than 80%. Some people say the real way to save space is not compression but owning less.
[Verify] Check the Japan Down Products Cooperative Association's position on compressing down products. The "suitable for vacuum bags" labelling of moth repellents follows the individual makers' explanations.
Misunderstanding 1｜A down futon can be flattened in a vacuum bag with no harm
The barbs break and the loft (warmth) does not return. Do not compress a down futon, or squeeze out only a little air, and take it out within 6 months.
Misunderstanding 2｜Vacuum bags are sealed, so no need to worry about mould or insects
Trap moisture inside and mould grows in there. Everything must be completely dry before it goes in. The seal is not perfect either: air gets in within months.
Misunderstanding 3｜A moth repellent in the bag makes it safe
Most repellents do not work as designed in a sealed space. Use a product labelled for vacuum bags and follow its instructions.
Misunderstanding 4｜The more air you remove, the more efficient the storage
Fibres break, creases set hard and the bag splits more easily. Stop at about one third.
Misunderstanding 5｜Once packed, it can stay shut until next winter
Take it out and air it once every six months. Creases, smells and mould all scale with how long it is left.
---
Sources
- Japan Down Products Cooperative Association (日本羽毛製品協同組合), "Correct handling of down futons (storage)"
https://www.jdfa.or.jp/
- National Consumer Affairs Center of Japan (独立行政法人国民生活センター), "Product test of vacuum storage bags for clothing"
https://www.kokusen.go.jp/
- Japan Household Insecticide Industry Association / Japan Moth Repellent Council (日本家庭用殺虫剤工業会／日本防虫剤協議会), "Correct use of moth repellents"
https://www.jsia.or.jp/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Follow the care label and the maker's instructions for any garment, shoe or bag. For expensive or sentimental items, ask a specialist cleaner or repairer.
Sources
Tell us if this has changed
Approved contributions keep the contributor's name, shown in five languages.
Related questions
Other languages：日本語 ／ 简体中文 ／ 繁體中文 ／ 한국어
Value Village is not a government body. Always confirm procedures on the official site.
Written by Value Village from public sources. Nothing here is reproduced from another site.