Outdoor Products Sea-Tac Rolling Backpack, 45.9-Liter Storage 420D POLYESTER 1/4 RIPSTOP Rolling backpack with inline skate wheels and retractable tow handle Non-slip shoulder straps made of breathable fabric and fold-down padded back Expandable main compartment with 5 subdivided pockets; divided front pocket CD pocket and exterior cell phone pouch; stowaway harness for shoulder straps 2,800 cubic inches; measures 14 x 21 x 9 inches (W x H x D); lifetime warranty