High Pressure Mini Pump w/Gauge
Small, light and doesn't take too long fill an empty tire. It can be a little tricky connecting it properly but this is a minor complaint because it rarely happens. Very small and love that it can be used for both types of tire connections.
While I also carry a CO2 inflator, I like to have a small light weight pump handy for topping off and as a backup once you use the CO2 on hand. There were a couple of issues with the mounting. The mount is designed for a round tube so didn't conform to the post on my bike. Also, the mount is designed so the pump extends below the bottle cage which I didn't like. I prefer to have the pump tucked in beneath the bottle cage and bottle so I flipped the mount around. The strap seems to hold well so I'm not too concerned about the pump falling off. I tested the pump and it pushes a decent amount of air but, as with all these types of small pumps, you can plan on getting a bit of a workout pumping up to pressure.