From the Air Fleet Collection. Four, multi-directional spinner wheels for better maneuvering. Shell is constructed out of polycarbonate composite which provides a tough and durable case. Push-button locking handle adjusts to multiple heights for easy mobility. Fully-lined interior. Top and side carry-handles provide comfort when lifting a fully packed case. Interlocking zippers allow for a lock to be added. Expands for additional packing capacity.