Outdoor Camping Hiking Trekking Backpack with Built in Lumber Support and Rain Cover - 3 Colors Available (Blue, Orange, Green) - 40L Made of 100% nylon, light weight and durable, Polyester back pad, more comfortable Built in Rain cover and Lumber support for long hiking trips and rugged use High quality YBS buckle and SBB zipper, 30-40L Large pockets for versatile storage With high density mesh back pad on shoulder strap and waist strap, more breathable and comfortable 40L Capacitiy - Outdoor hiking and trekking backpack