Ultra lightweight polycarbonate shells offer high impact protection Unique patent protected expansion section adds up to 25%additional capacity when needed Stylish curved internal aluminum handle system with transparent push button lock top handle Curved handle system reduces arm stress when rolling Corner transparent ball bearing wheels for stability Full lined interior with packing divider and organizer pockets Soft rubber top and side handles for extra comfort #10 interlocking zip pullers on main compaprtment Top mounted Add-A-Bag strap Luggage tag on each case