The HPRC (High-Performance Resin Cases) HPRC4100E Waterproof Hard Case (Black) is a lightweight, waterproof, unbreakable case. The case can be used to carry audio, photo or video equipment and accessories. It meets ATA 300 specifications for shipping cases. The hard resin shells are virtually unbreakable and the interior rubber O-ring keeps the case air and watertight. The case has an air pressure release valve. It is carried by a super-soft rigid grip handle. This case has an empty interior.