Made of durable ABS. All pieces fully lined. Lightweight. Self-repairing zippers on main opening; main compartment of each upright features slider which can be locked for added security. Push-button retractable handle for easy pushing and pulling. Top and side carrying handle. "Spin 360°" 4-wheel system allows bag to move easily in all directions. Expansion feature for extra packing capacity. Interior tie-down straps help to keep all of your packed items secure. Privacy pocket inside main compartment. Mesh zippered pocket on interior of lid. Zippered pocket on interior of lid.