Olympia"s heavy-duty rolling backpack is perfect for daily use with it"s easy-to-roll design you can protect your back. * Product Material: Supreme * Product Weight: 4.30 lbs. * Constructed of supreme rigid polyester * U.S. patented 2x2 in-line skate metal ball bearing wheel system that glides without a whisper * Internal locking retractable rectangular handle system * Padded shoulder straps for comfort * Spacious zippered pockets and internal organizer for your convenience * Side mesh water bottle pocket * Self repairing excel zipper