Wallet, keys, cell phone, duct tape, flash light if i might be out during the evening, tire levers, tube, patches, mini pump, selection of allen keys, spare links, chain tool, knife, multitool, digital camera, gloves, couple liters of water...all fits in my cargo pants or camelbak mule. Even if I'm only going to be out for a little while on trails close to town, I still like to be prepared.