Topeak Road Morph. Its not the lightest pump out there, but is the lightest I know that gets the job done. Its cool cuz it has this thingie that flips down like on a floor pump, so I can easily inflate to 100 psi. I use CO2 if hubby is out riding too, but if I am alone the road morph is the only pump I'll trust, and I am a weight weenie too!