Recessed in-line w/ metal ball bearing wheel system Push button self locking internal retractable handle system Expandable feature offers 25% more packing capacity Comfortable Top and side grip handle Button handle for easy lifting Add-a-Bag feature large front zipped pocket for additional packing Inside zippered mash & shoes pockets and detachable clear PVC pouch EVA foam front panel Elegantly imprinted full interior lining Maximum strength industrial hardware