Always have mil spec 550 cord along in the daypack, min 50ft. Have 2 100' lengths in the vehicle kit. It's just so strong and useful for so many things.

I won't hang from it though. Someone was talking about multiple runs of 550, but, you run into a bunch of other problems, like how to belay, abrasion on small diameters, blah blah blah. If we're hiking in the mountains, even if we don't expect any technical climbing, but, are exposed to areas where someone injured might need assist, or we could "fall into a bad situation" then at least 2 members in the group will carry a 70M length of 10mm dynamic dry climbing rope, locking 'biner, a figure 8, and harness, maybe an idiot proof belay like a Gri-Gri too. Obviously we'd have more if we were planning a technical climb, this is for the, oh %$#@ we are in trouble situations.

Cordage is cool stuff, 550 is awesome for so many things that I always carry some. Just wanted to make the point that it's not a good choice for supporting humans.