I tend to think that you should have at least 100' of cord (paracord or similar polycord) with you when treking in the out-of-doors. I've heard many say to keep it in 50' lengths, but I find that is not a convenient length for me.

I tend to carry at least six or eight 15' lengths wrapped in little palm-width bundles (great for use with tents & dining flys, can be tied together for clothes lines) and then one 50' length. I've thought about using different color-coded lengths of 15' and 25' lengths, but haven't done that yet. I rarely use the 50' bundle.