Looks like the server ate the thread I started last night, so here goes again. I was shopping for a frame pump when I saw a tiny CO2 cartridge pump from "Genuine Innovations" at my LBS. I bought it on impulse, as it and a spare cartridge fits nicely into my under saddle wedge. I usually am within a reasonable distance from home or car, so the pump is more 'security blanket' than necessity. Anyone have one? Storage life of 16 gram refills?