This edition of the 1605Air comes lined, but without foam or other inserts, allowing you the freedom to completely customize the 26 x 14 x 8.4" interior to your specific needs and to your specific gear. Your case is made of a super-light proprietary HPX2 polymer, with honeycomb structural elements, which is up to 40% lighter than most other Pelican polymers. Five newly designed dual push-button latches, arrayed on three sides of the case, provide ease-of-use versus previous iterations, and clamp the lid tight to keep dust, dirt, and water out. Case design features include an O-ring that seals it to an IP67-rating to be dust and waterproof, dual 5/16" (8mm) diameter stainless steel reinforced padlock holes, and a pressure relief valve. This valve regulates the internal pressure, keeping your gear and the case from getting crushed and allowing you to open the case without having to break a tough pressurized seal that may develop. A polycarbonate card holder may be placed on the front or side of the case.