This backpack features three large compartments to store all your stuff. The compartment closest to your back is designed for storing a laptop up to 16" in size. The laptop compartment is directly against your back with about 1/2" thick of padding. A padded internal divider keeps the laptop in place and an elastic 1" wide strap with hook and loop material keeps the laptop securely inside its special subcompartment.
In addition to the laptop subcompartment the rear compartment includes an additional 2-3" of storage space and features an additional unsecured nylon pocket. In total the rear compartment features about 18" x 11" x 4" of storage space.