Ordered two of these. Tried each - heats up quickly and is very warm to the touch. However, they are quite thin and are covered in cellophane plastic that "feels cheap". I don't think they would fit a hand warmer in my pocket etc which is what I wanted because they don't seem strong enough to resist folding or bending. I also don't know how long they will last with repeated heating and use. I think they will work on warming a cup with something to drink if and as long as they do.
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