I just dig it to "contain" things. Most brands of foil nowadays are too thin to cook in "Boy Scout style" in a fire. But it holds up long enough to get a fire going on top.

That said, I still do remove the foil from my Ritter PSP and just put a small amount back in. I'd rather use the room for a small LED light, water sanitizing tabs, firesteel, etc.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman