JanSport Trail Series Carson Backpack nylon Ergonomic S-curve shoulder straps with large main compartment with panel and top load access Extendable lid with zippered compartment with adjustable aluminum frame system Dual side water bottle pockets and dual foam padded hipbelt for cushion comfort Dual density hipbelt with breathable mesh lumbar cushion stays dry and comfortable Capacity- 4900.0 cube inch / 80.3 length