I have a 26" 3/16" stainless cable that I had made up at a marine place, which together with a small Abus (#30/85) padlock weights about 130 grams. Almost never use it, but there's been a few times I needed to go to the bathroom for 1-2 minutes and so locked the bike up and was glad I had the cable/lock.
This little guy is for emergencies only when I'm out on a day ride. But it's effective if you take the front wheel with you and lock the rest to a tree or fence for the few minutes it takes to do your business.
When touring I have carried a Kryptonite Evo 2000 mini and a 7' kryptonite cable. I have left my bike locked up with this arrangement overnight in low crime places but been uncomfortable about it.
Last edited by bccycleguy; 06-27-06 at 10:50 PM.