I'll never understand folks who carry CO2 inflators instead of pumps. I've lost count of how many times I've had to "rescue" folks on the side of the road who'd accidentally emptied their CO2 cartridges to the atmosphere (either due to fumbling, or having the inflator/cartridge attachment fail) while trying to inflate their tires. How much weight are they saving anyway? My gigantic Silca pump with metal Campy head weight 5.5 oz while some minipumps weigh as little as 4 oz. An inflator with two CO2 cartridges weighs about 2.5 oz, so they are sacrificing reliability for the sake of 1.5 oz. Ridiculous I say!