I have an Innovations Air Chuck SL Mini. It's super minimal and I keep it in my saddle bag. There's no external thing to put the CO2 canister in, so you don't want to use it without gloves. I also have a full size frame pump in case the CO2 fails. I've never had any problems with my Air Chuck, though.
http://www.rei.com/product/722067?cm...:referralID=NA
I have a floor pump that I use most of the time. CO2 bleeds out of your tires, so if you pump up your tires with CO2 they'll be flat the next day.
My advice is to get a floor pump for your main pump and a CO2 pump just for emergencies/flats on the road.



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