Expandable compartment. Split level design allows for easy access. Fleece lined padded iPad sleeve. Interior organizer pockets. Stowable front accessory straps. Retractable handle. Replaceable urethane wheels. Lockable zipper cars. Bottle opener. Molded bottom. Volume: 2800 cu. in. [ 46L ], Expanded: 3360 cu. in. [ 55L ]. Size: 21 x 14 x 14.5" [ 53 x 35 x 37cm ], Expanded: 21 x 14 x 17" [ 53 x 35 x 43cm ]. Weight 7 lbs. [ 3.1kg ]. Materials: 400D Nylon Ripstop.