Just like oversized pumps, when it comes to CO2, fat and plus bikes have special requirements when it comes to inflation. The comically oversized tires don’t need much in the way of pressure, but they require a lot of volume. If you’re the type who would rather pop a CO2 cartridge than cool off while getting out the pump, then over heat when pumping, The Fatty Object may be worth a look.
Calling it the first inflator specifically designed for fat bikes, The Fatty Object gets its fat bike cred thanks to an oversized control knob that is easy to use and control with gloved hands. Machined from aluminum, the inflator fits both presta and schrader valves without changing any parts. 
Of course, you can’t have a fat bike inflator without a fat bike sized cartridge. Joining a few other 38g cartridges out there (like MSW), the threaded cartridge promises to inflate a 26 x 4.8″ tire to 6-7 psi, or a 29 x 3.0″ tire to 20-22 psi. As a nice bonus, the cartridge includes a foam insulator sleeve in case you are using the inflator without gloves.
Together, the inflator and the cartridge have a claimed weight of 80g, and the inflator includes a lifetime PDWarranty. You can pick up the inflator/cartridge combo for $35.00, and replacement cartridges run $12.99.
