I carry one of these. I have used them in anger a couple of times and they work. The three CO2 cartridges are enough to get you going but won't get you up to normal running pressure so a steady ride and a stop at the nearest service station to top it up with air is needed. Or carry a little bicycle pump and excercise those biceps.
http://www.rema-tiptop.com/portal/in...?page_id=40233
