Constructed of durable polyester. Light weight construction. Reinforced corners protect wear points from rough baggage handling. Interior tie-down straps help keep all of your packed items secure. Mesh zippered pocket on interior of lid. Spin "360°" 4-wheel system allows bag to move easily in all direction. Retractable push-button handle locks into place when extended. Top and side carry handle for convenient carrying options. Expansion feature for extra packing capacity.