Bee,

Here is a picture of the sides of an 18" piece of heavy duty foil folded twice the get four layers. Link to big picture



Here it is folded and holding water. Link to big picture



I do not have time right now to boil water in it, but I could. <img src="/images/graemlins/grin.gif" alt="" />
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Thermo-regulate, hydrate and communicate.