The Small Backpack has a Main zippered compartment of 669 cu. in. of space, with an internal zippered pocket.The Middle zippered compartment of 330 cu. in. of space, with three internal pockets.The Top front pocket (70 cu. in) has a loop fastener strip on the outside for name tapes and/or moral patches.The Bottom front pocket (175 cu. in.) and the sides of the backpack have MOLLE compatible webbing to make the Small Backpack a modular system.The backpack also has a large Padded Hydration Bladder compartment on the back with a hook and loop enclosure.Other features include: adjustable padded shoulder, waist, and sternum straps with quick connect buckles, adjustable compression strap, and a top heavy duty carrying handle.Other features include: adjustable padded shoulder, waist, and sternum straps with quick connect buckles, adjustable compression strap, and a top heavy duty carrying handle.This is a Small Backpack with a ton of storage space for its size with many compartments and pockets to help organize your gear.