The high-density polyester and fiberglass frame are ultra-strong and are built for optimum strength while maintaining a light weight packing case * Corner mounted ball-bearing wheels are connected directly to the frame for smooth and stable rolling * The trolley system has a friction locking handle and is constructed from a single piece of aluminum and runs down the sides of the bag, leaving the bed of the case flat and crease free * Two large front zipper pockets for additional storage of personal items