Multi-functional survival uses for a condom (willowhavenoutdoor.com)

"PS – Buy non-lubricated & no spermicide condoms."

Heh, yeah that Condom slingshot could be very dangerous if it is so slippery!

Churchill is reputed in WWII of contacting a condom manufacturer to make muzzle covers for soldiers - keeps the water out of your rifle in the rain.

Not really survival related, but back in graduate school my friends in the low-temperature physics lab used condoms as a critical part of a vacuum regulator. I walked in there once to hear them arguing over whose turn it was to enjoy the privilege of going out to the drugstore to buy more.