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The original was posted on /r/lifeprotips by /u/Fiftydollarvolvo on 2025-11-04 06:05:31+00:00.

they are air-activated. you can get 2-3 uses out of one warmer (depending on how long each use is) by sealing it up in something airtight. i like a ziplock because you can squeeze all the extra air out of it to help it cool down quicker. i would keep one in my jacket pocket and re-shake it up right before getting off the bus for quick, short uses. just seal it back up for next time :)