This stuff has so many uses I couldn't write them all down here if I had a week to do it. Just get yourself some 550 paracord. It's cheap, versatile, and better to have it and not need it than need it and not have it.
Seems like the type of thing you might leave somewhere at home, then find yourself needing it when you're out. It's not the type of thing you would carry around right? Wrong, you can carry it around, paracord bracelets are very nice to look at, easy to make and handy if you find yourself needing some in a pinch.