I carry 2 tubes, a patch kit and an Axiom pump that is a combination hand pump and CO2 cartridge inflator. I also keep dollar bills handy in case my tire is punctured and I can slip the dollar bill in between the tube and tire to get me home.

If you decide to carry a compact hand pump, know that you could snap off the valve if you are tired and you are struggling to inflate it to pressure. It happened to my mtb. I like the Topeak Master Blaster road pump because it has a retractable hose which makes it unlikely that you'll break off the valve during inflation.