The PB-2750 Hard Cases are watertight, have a pressure relief valve, easy to operate latches, and a comfortable hand grip. They are constructed with a high-performance hard-resin material reinforced at the corners. The PB-2750 is ideal for video, audio, and photographic equipment transportation and protection. The PB-2750F is also the perfect way to carry the DJI Phantom Quadcopter. They are lighter than many comparable brands and save you shipping costs.