The Middle zippered compartment of 350 cu. in. of space with three internal pockets.The Front Top Compartment (49 cu. in) has a loop fastener patch on the outside for hook & loop name tapes and/or moral patches.The Front Bottom Compartment (161 cu. in.) with some internal organizational pockets and a Snap-Hook keychain holder.MOLLE compatible webbing sewn onto the Bottom Front Compartment and the Sides of the backpack, to make the Sling Backpack a modular system.The backpack also features a large discreet, padded, and lockable CCW Pistol Compartment on the back with a small padlock compatible Metal Zippers (padlock not included).Other features include: adjustable padded single shoulder strap with quick connect buckle, adjustable side support strap with quick connect buckle, and a top heavy duty carrying handle.This is a Sling Backpack has a lot of storage space for its size with many compartments and pockets to help organize your gear.A discreet way of carrying a concealed carry weapon.