Originally Posted by staehpj1

Why not? I think CO2 is a pretty bad idea for any but short tours, whether ultralight, ultra heavy, of anything in between. A lot of mini pumps are lighter than most inflators and one cartridge. By the time you have a few cartridges they are as heavy as some pretty nice pumps.

Additionally CO2 seems to bleed out much faster than air leading to more frequent topping off.