Mostly fixing others flats or handing away tubes. I'm always grabbing tubes when on sale. I carry patches but usually just give them a tube. Incredible how many riders DON't carry or know how to fix a flat. Even more strange is the many who carry a small pump but no patch, levers or spare....???? My hydration back pack is quite well stocked of misc. McGyver stuff, 26" and 700c tubes, snacks for those to near bonking.