The PB-2750DKAUD hard case is 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-2750DKAUD features an audio lid insert which is attached to the inside lid. The audio lid has a boom pole holder that keeps your boom pole safe and in place so it doesn't move around. The PB-2750DKAUD can accommodate a boom pole up to 26" long. Zippered, mesh pockets make for easy viewing of all of your small audio accessories.