Bought mine here .

Agree about cup/canteen combo. That's method in my larger kit(s)/packs. The Ti foil intended strictly for small PSK-type kit, like my Maxped Pocket Organizer where "(small) size does matter." As for cost (for "just a piece of foil"), I figure that I've already gone to some expense to outfit with the best small bits of gear I can find, so what's another $15 (I can rationalize anything, given enough time ).