Light, Durable, Capable
I have had this pump on my road bike for 10 years, used it countless times and it has never let me down. Dual settings help you get volume fast and then high pressure at the end. Stays out of the way and doesn't weigh much at all. I prefer this setup to CO2 because no matter how many times you flat you always have what you need!
Make sure you get the right size and it will fit tight and not rattle at all. I got 8 years out of the included strap before I had to replace it - no complaints though.