Constructed of 1800 D. supreme ultra polyester Recessed in-line skate metal ball bearing jumbo wheel system Push button self locking internal retractable aluminum handle system Expanding feature offers 25% more packing capacity Interior top hanging zipper pocket & dual buckle tie-belt system for added packing convenience Dual shoe pockets and a zipper mesh pocket for your packing convenience Water bottle pocket Elegantly imprinted full interior lining EVA foamed front panel