Small patch kit, one tire lever, small multi-tool with phillips head, flat blade, 4,5,6 mm hex. I also just started carrying the ritchey torque key for carbon parts (great little mini-torque wrench set at 5n), $20, and a cell phone. The only time I've needed more than that was once when my bottom bracket started to loosen up. An 8mm hex would have been useful, but it's not worth the weight for most rides.