The Pelican 1400 case was designed for 2 things. Keeping whatever is inside safe and giving the customer an easy to use, user friendly approach to protection. Pelican products developed the Pelican 1400 case because of the need and constant demand for an indestructible case that can go anywhere. Anywhere you can go this 1400 case can come which for you means so can your equipment. The case itself is a water proof case and will prevent water penetration, even when submerged. The secret to the 1400 waterproof design is an o ring seal. The Pelican 1400 case also features a purge valve which allows air into the case, but keeps moisture and dust out. The reason for this feature on the Pelican 1400 case is so that opening the case in high altitudes is easy. (Otherwise the lid of the Pelican 1400 would be stuck shut)