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you do need to activate them for 30 minutes...not only to get them flowing so they will work for the trip, but to make sure you dont have a dud, as duds are fairly common. 1 in 15 anyway...if not more sometimes.
dont leave it in the foil or plastic pouch. wrap it in newspaper. wrap it a lot if you only need a alittle bit of heat wrap it little if you need a lot
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