Right now I have a Galaxy tablet, Oakley Gascans in holder strapped to shoulder strap, Droid X smartphone in holder strapped to shoulder strap, Small first aid kit in side, small survival kit with bare essentials, Sig water bottle in the bottle pouch, Aquamira pro filter, a few purification tablets, 100 Euro in hidden pocket on the strap, pens, pencils, notepap, lighter, tabbaco (for my consumption), Gotorade individual powder packs, umbrella, battery case with AA batteries X 8, 2xAA flashlight, compass on one zipper pull to main compartment, thermometer on the other, keychain flashlight on the inside zipper pull, shaker bottle with four protein shake individual packets inside, tennis shoes, shorts and t shirt, microfiber towel and a toiletry kit. AA usb charger for charging phone with batteries.
I think that's it.