For sticking things to walls and other smooth surfaces. <img src="/images/graemlins/smile.gif" alt="" /> I had a tiny bit of wall sticky floating about in my desk, and it just got added on a whim. No real mass, very little volume, and it isn't water soluble.

This isn't a survival kit, but it can function as such. It's an EDC.

And the wall sticky has been used on a few occasions over time. Balls of it have been used to to hold PCBs during soldering so it is (a) off the bench and (b) components are supported. Along with the normal mission.