Shotgun shells, one size or the other usually fits. Pistol casings also make nice covers for tube caps. Beer bottle caps for pedal dust covers. Use silicone caulking as glue (easy to remove) for the pistol rounds for tube caps, glue the shotgun shells in and glue the beer caps to the pedals for emergency dust covers. If you get a flat and have nothing to fix it with jam your shit and u-trough into the tire in place of air. If your frame breaks use a ratchet tie down to hold it together to get you back, that is if you can find one when you need it. Old klunker trick that.