In my saddlebag I carry, a small tire boot, 2 tire levers, 2 CO2 cartridges and very small inflation tool, some cash, an expired drivers license, 3-5mm Allen wrenches, small stick on patch kit.

In my jersey pocket I carry, one tube, a cell phone, a bit of food (dependent on distance but I don't eat much -about 250 cal per hour).

On the bike are 2 bottles and a rear blinky. I usually ride without a computer unless I'm doing a specific workout and then I have the powermeter.