Alps Mountaineering Contour 18 Backpack - The perfect simple design combines with a lightweight and durable 200D nylon double ripstop fabric and uses 3D mesh suspension straps for all-day comfort. The reverse direction lid provides easy access to the inside features, and the stretch side pockets are large enough for 1L Nalgene bottles. Need extra hydration options? This packs also offer a hydration bladder-compatible interior with a hose port. Features Lightweight and durable 200D nylon double ripstop fabric 3D mesh suspension straps Reverse direction lid provides easy access Stretch side pockets, large enough for 1L Nalgene bottles Hydration bladder compatible interior with hose port