The Ozark Trail 19-Liter Kalispell Hydration-Compatible Backpack is lightweight, versatile and rugged. It has a 19-liter holding capacity and is made from a heavy-duty ripstop material. This bag has an integrated design that combines a lightweight backpack and a hydration system. It features an interior storage sleeve that securely holds a hydration reservoir, laptop or tablet, as well as multiple storage compartments for additional gear storage and organization. This Ozark Trail backpack also sports air-mesh padded shoulder straps and back panel for added comfort and support.