Sairim Dark Vault Critical Gear Case Non-Blocking, Black. This is a product from a brand that manufactures Surefire option parts, etc. It has never been brought into or used in harsh environments such as underwater or dusty conditions. This is a waterproof case for communication devices and other small precision equipment. It is possible to attach patches with Velcro, and to attach the case itself to the chest using the MOLLE system. It can be locked using a commercially available padlock.