LINE-X Accessories Expedition 130 Liter (4.6 Cubic Feet) Storage Case is manufactured with LLDPE, Linear Low Density Polyethylene with a double wall design for strength and durability and is gray in color. The LINE-X Accessories Expedition Storage case provides a secure, water proof design to store users important belongings and comes with heavy duty rubber pull down latches to secure the lid. The lid has a built in, quality rubber gasket which creates an air tight water proof seal against the case body. The hinge system is built into both the body and lid for added durability and is connected by a 304 stainless steel rod to prevent damage and problem free opening and closing. In addition, the pressure release valve helps to equalize pressure between the inside and outside of the case, in case differences in pressure occur creating a vapor lock effect. An installed 304 stainless steel lock plate allows for use of a padlock or other locking mechanism.