Constructed of durable ABS. Lightweight construction. Interior tie-down straps help keep all of your packed items secure. Lining zippered pocket on interior of lid. Privacy pocket inside main compartment. “Spin 360” 4-wheel system allows bags to move in all directions easily. Retractable push-button handle locks into place when extended. Top and side carrying handle facilitates carrying and lifting. Expansion features for extra packing capacity.