The PB-2750 hard cases are waterproof, feature a pressure relief valve, easy-to-use latches and a comfortable handle. They are made from high-performance hard resin material, reinforced at the corners. The PB-2750 model is ideal for transporting and protecting video, audio and photographic equipment. The PB-2750F is also perfect for carrying the DJI Phantom quadcopter. These cases are lighter than many comparable brands and allow you to save on shipping costs.