Mens Large 21" Military Style Tactical Gear Molle Hydration Ready Backpack Bags 2 large compartments: lots of storage space, can fit laptops up to 17"; Main compartment has a hydration water bladder pocket and hose pass-through slot at the top for water tube 2 front zippered pockets, side pockets: 1 mesh, 1 zippered, 1 water bottle pocket with drawstring closure Molle straps on backpack for attaching items and internal organizer: 3 pockets, hook on strap for keychain Adjustable padded shoulder straps with chest strap, and waist strap with quick release buckle that is adjustable for perfect fit Dimensions: 21 x 12 x 7; Material: 600D Polyester for daily durable use