Saw something like these watching the new Russian bushcraft show. Looking through the related forums, I had realized that they've became very popular among Russian "bush-men" in recent years. Probably because of their nearly infinite reusability.


The principle is simple. The pack generates heat when the salt inside starts to crystallize after initiation by the catalytic element inside. To recharge - just boil it until completely soft again.

Does anyone have any experience with the above product available on the US market? Can it be good for camping? Or perhaps there are other similar heaters available?