For fuckaround trips, I use a Nikon bag: fits 5d II body w/ grip, battery charger, case w/ 4 16 gb memory cards, a flash unit, and any one lens I choose. On the top cover it fits a lens dust wiper, zeiss sexy cloths, 64 gb flash drive, gum, headache pills, a condom, and my cell phone. On the outer pocket, it fits a memory card usb reader, cologne, and a swiss army knife. Finally, on the back outer pocket, I have a colorchecker passport, a flattened super sexy milk jug diffuser (no joke), and 3 sets of 4 aa batteries, 1 set of aaa batteries, all in individual cases, and a yongnuo transceiver set.