It has four zippered compartments with space for important travel documents such as passports or a portable CD player.  The main compartment has a huge 2.6 liters of space with a tent cover that can be deployed by pulling a drawstring.  Built-in are a quick release key ring, a penholder, and two integral sheaths for cellular phones, flashlights, or mace spray.  Also there are two sets of nylon webbing anchors to use with our special  "snap and anchor" attachment system.  A two-inch wide nylon webbing shoulder strap helps distribute weight comfortably.