Mine is not "mini", but fits easily in my triangle frame bag. It's mostly aluminum, weighs nothing and can be easily attached to the frame with included hardware. I saw a guy who was keeping it inside a seat tube. It's 13 inch long and very skinny.
I tried CO2, but they were useless for bigger tires, not always working right, and if you have 2 or 3 flats during the ride - you are out of luck.
I ride long distances, and I needed something that will work each and every time I need it. Did a long and confusing research what is out there that can last, pump tires quick, and is able to pump up to 120PSI or more if needed.
I bought this one at Performance Bike. I believe it was their brand Spin Doctor - model Hurricane. I'm trying to find few more of these for gifts. Awesome pump, and good for both valves with included schrader adapter.


http://www.performancebike.com/webap...52_1031044_-1_

http://www.performancebike.com/image...ini%20Pump.pdf

I believe this one is an updated and little smaller version: http://www.performancebike.com/bikes...87_-1___000000