1,300 cubic inches in the main pouch. Draw string closure with laser-cut webbing on the outside. 2 sustainment pouches, one on each side. padded should straps. This pak gives you the option to use this as a normal pak or to tuck in the should straps in the secure slots and attach this pak to your plate carrier. Top flap has a velcroed compartment for storage and a pocket on the inside for a hydration bladder or miscellaneous gear.