I had one time, I was out on a ride, some dumb*** probably on one of those 15K plastic bikes, had left a tube on the side of the trail, not a cheap $4 tube like I use, but one of those $25 thinner-then-a-condom type tubes, yeah I picked it up, they patch just as well as the cheap ones. This served the dual purpose of an extra spare, and cleaning up someone else's mess on the trail. Then again, some people think I am weird, in that I believe that we should respect God's creation, not trash it.