COOP Disposable Body Warmer 20 pieces Regular Size Warning! [Expiration Date] 2024.12 The performance may be reduced due to the expiration date. (I used a product with the same expiration date in 2025.11, but the warmth was not particularly problematic. Although I did not measure the usage time precisely, it lasted for a considerable amount of time. ← This does not guarantee the quality!) For the 10-piece pack, the contents will be delivered after opening the outer bag. They will be sent in simple packaging. Please purchase only if you understand that these items are stored at home. Thank you.