Automatic Pressure Purge System: Seahorse’s Automatic Pressure Purge System guarantees a perfect seal by incorporating its own O-Ring under one of the latches. You will never forget to set the valve since it automatically activates when closing the case. Pressure is released as you open the latch. Molded-In Padlock Holes: Case has a molded-in padlock hole to secure your valuables. The padlock hole will accept “TSA” and most standard padlocks. Accuform Foam: multilayer protective pre-scored cubed foam. Accuform Foam in Seahorse cases consists of a layer of egg crate foam in the lid, a thick cubed foam center layer, and a 1/2″ thick high density shock absorbing foam bottom layer.