I've got a couple straps that I use for random utility stuff. They're 1" polypropylene webbing, with a side release buckle. Were I taking them touring, I'd get buckles that inter operated with the ones on my panniers. One side of the buckle has a ladder lock. One stays on the rack of my commuter and helps keep my lock from rattling. The other lives in basket of my beater utilty bike. The one on the commuter was made from about 2' of webbing, the one in the basket was maybe three. They're shorter than that, of course, because the buckle is sewn on at one end, and the opposite end is folded over twice to keep it from coming out of the buckle.

I don't use them a huge amount to attach loads, but they're handy enough to keep around. The other thing they're very useful for is holding the front wheel of the bike to the frame, when the bike is on a car rack, or the work stand. Also useful for keeping a brake lever applied, while you adjust the cable. Thigs like that.