The Sling Backpack has been designed with 5 separate zippered compartments to organize and carry your essential gear. Sewn into many of these compartments are lot of internal zippered, mesh, and small pockets for easy access and to help organize smaller items. A Discreet and Lockable CCW Pistol compartment is constructed into the back panel. MOLLE Compatible webbing on the exterior for attaching other MOLLE compatible gear. Features a discreet CCW Compartment with metal zipper loops that can be locked with a small padlock (not included). Loop fastener patches sewn inside CCW compartment for securing hook & loop pistol holsters (not included). Main Compartment dimensions: 16.0" H x 10.0" W x 4.5" D (720 cu. in.); Middle Compartment dimensions: 15.0" H x 9.5" W x 2.5" D (350 cu. in.) Front Compartments: Top 4.0" H x 7.0" W x 1.75" D (49 cu. in) with loop fastener patch sewn onto the front for hook & loop patches. Bottom 9.5"H x 8.5"W x 2.0" D (161 cu. in.) with internal small pocket and 3 pen slots and Internal Snap-Hook key chain holder. Vertical and Side compression straps. Includes a MOLLE compatible water bottle carrier.