Genuine Innovations Air Chuck Elite with 16g CO2 Cartridge
The Air Chuck Elite's push-to-inflate technology is easy to use and is compatible with both Presta and Schrader valves. Its all-metal design weighs 17 grams and works with all Genuine Innovations 12g, 16g, 25g, and Big Air! threaded cartridges.
Air Chuck Elite comes with one 16g threaded CO2 cartridge for fast, easy, and controllable single-handed tire inflation.
I have been lucky enough to only have to use this a few times but it has not disappointed me. This is as small as you can get for an inflator. I was a bit nervous at first but it worked great. Size allows it to fit anywhere you need it to.