ALPS Mountaineering Caldera 4500 Internal Frame Pack, Blue Shoulder strap padding wraps to back for comfort; Top pocket converts to a fanny pack; Rain cover included; Blue, lightweight polyester ripstop Dual aluminum frame stays; Top load - extendable top lid; Spindrift collar with draw cord; "Over The Top" compression strap Hydration pocket/port; Front access to main compartment; Front stretch neoprene pocket; Front wing lashing system; Multiple side compression straps Rescue whistle buckle on sternum strap; Lower side bottle pockets; Lower extra-large door w/#10 zipper; Internal horizontal divider Torso Range: 15.5 to 20.5 Inch; Capacity: 4500 cubic Inch - 74L; Weight: 5 pounds, 7 ounces; SKU 2433802