Black Compact Modular Hydration Backpack. Rugged Tactical Polyester. * Includes: One Large Main Compartment. One Outside Pocket With Inside Mesh Accessory Pockets. * Hydration Pocket With Velcro® Closure And Carrying Handle; Complete With 2.5 Liter Bladder. * Modular Attachment Points On Front Face. Expandable Design And Stay-Cool Mesh Backing. * Fully Adjustable Shoulder Straps. Heavy Duty Zippers And Hardware. Fully Expandable. Size: 17" X 8" X 5"