Mountaintop Hiking Climbing Backpack 40L-5815I 2,440cu in backpack for or overnight, weekend, three-day excursions or outdoor sport Material: Rpistop Nylon; Water-resistant, Stain-resistant -shape detachable steel frame with 3D suspension system can separate you back and the pack, allows air to pass between for a cool and comfortable feel Hydration-system compatible allows for convenient thirst quenching A matching rain cover in the zip bottom pocket, hip-belt pocket keep items close at hand