Or when the pump breaks! Every time a thread like this starts someone will post that they use CO2 because every time they needed to use their pump it was broken, and then someone else will post that they use a pump because every time they needed to use their CO2 it was broken. So, since I am not a weight weenie I have adopted the only logical strategy based on the collective experience: I carry one of each and if they are both broken, I call my wife to pick me up. If my phone is broken too, I walk. If my leg is broken too, well I'm having a real doozey of a bad day, aren't I?

Ken