For my commuter, I've got a multitool, tire levers, patch kit, spare tube, chain tool, extra pins, the battery pack for my rear light, bunch of zipties, electrical and duct tape.
On my road bike, I've got my CO2 with 2 cartridges, patch kit, multitool, tire levers, and a spare tube jammed between my seat and the saddle bag.

Oh yeah, I forgot, some antibiotic cream in a pack that I got from the first aid kit, a large bandaid, and $5.

I'm wondering how people fit food in there without having the other stuff wear a hole in the wrapper.