600D polyester with latex rubber backing and reinforced ripstop nylon. Huge main compartment with oversized zips and extra wide U-shaped opening. Solid built base locker compartment with reflective piping. In-line skate style wheels with corner protectors. Reinforced base fabric and plastic sliders. Recessed extendable telescopic handle. Oversized quick release side compression straps. Extra wide webbing and expedition grade hardware and metal zippers. Velcro wrap carry handle.