The Nanuk Desiccant Silica Gel Pack comes in an Aluminum Canister and helps keep gear stored in bags and cases dry. The 5.9 x 3.5 x 0.4" metal canister fits inside many Nanuk and other cases. The gel is orange when dry, and green when saturated. To reuse the gel, simply put it in a conventional oven at 250° F for three hours.