Here is a picture of the back compartment. This compartment has the compression straps attached to the outside wall, which not only has the foam inside it, also has the storage pocket for the backpack straps on it so it is very well protected. This compartment easily swallowed a bundle with a pair of blue jeans, casual shirt, socks, underwear, a spare short sleeve shirt to sleep in, a set of lightweight lounge pants, my dress shirt and a suit along with my dob kit and electric shaver on the first trip. I'm six foot two and 200 pounds, so while my clothes are by no means the biggest of the users on this board, my clothes do take a fair amount of space. There was enough extra room around the bundle I could have put a set of shoes in this compartment if I wanted on the trip.