Explorer U.S. Military Level 3 Tactical Backpack, Medium Three compartments, two extra side pockets, front easy access pocket. Padded shoulder strap with a chest strap to fasten the shoulder strap in place. Hydration Ready Capable of housing a 72 oz hydration bladder Plenty of pockets and compartments to keep everything organized Size: 17 x 12.5 6.5 Made from heavy-duty 600 D Polyester