When reactivating, they melted

First of all, it was unclear to me before I bought them, that I was buying a pack of 8. I bought 2 thinking I was buying 2, not 16. I could see the usefulness, so I kept them. The first time, it worked great. But you need to somehow keep it in boiling water but where it doesn't touch any part of the pan that is keeping the water boiling, as the directions say. They melted. Useless. I have been trying to stop using plastic, but I thought these would last a long time and would be worth it. They are not. A hot water bottle is a much cheaper and better investment.

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