Maybe that is why Doug Ritter puts it in the PSP and PSP+.A bit of foil can be used as a wind screen,heat reflector,pot lid and to wrap a bit of food to coal bake.Foil can be folded to fit in a lot of places.It's a good multi tasker to include in kits.

BOATMAN
John

Plenty of heavy duty (not standard weight) aluminum foil will come in real handy and is among the most versatile of supplies, while weighing next to nothing. It makes a superb heat reflector, provides a fireproof base when needed, can be formed into cups, pots or pans and has numerous other cooking uses and it can be used in various ways for signaling, just to name a few of its many possible functions. You can never have too much aluminum foil around a survival camp.