Like many daypacks, the main body of this bag is split up into two well-defined compartments. The top section is meant to carry everything that isn't a camera, like hard drives, snacks, and extra clothes. Unlike many other daypacks I've tried out, however, the top section is actually very roomy. I packed it full of every power cord, notebook, hard drive, and USB cable I could find, and it still had enough room for a spare pair of pants and a couple extra shirts. I could have kept going. Plus, it's a roll-top, so you can squash it down or expand it as you need the room.