Military CLASS is designed to eliminate moisture for the medium size of the gun/knight safe. (About 80 cm). With the lightweight and outstanding looking, bringing it with a case is not a hard worki anymore. In the gun/knife case, Military Class could absorb moisture so that your gear in the case would be never rusty or moldy. After 1 month of using it, it would absorb full of moisture, you could hear it by microwave for about 3-4 minutes. Then it will recover absorbing capability.