Let's not forget about dental floss, or at least the dental floss they sell in the US: immensely strong, lightweight, it floats and it can be invaluable for getting those sinewy chunks of rabbit or lizard out of your teeth after a survival meal <img src="images/graemlins/smile.gif" alt="" /> . Seriously, though, I pack both dental floss and fishing line in my large PSK, because the floss would make much sturdier repairs on anything that required sewing. You can even use it for an emergency rapple ... if you have a couple of miles of the stuff!