37/40mm Waterproof Ammo Case 3
These are cases for storage of 37/40mm rounds up to 5" OA length. As you can see in the photo, there is a rubber gasket that provides a good watertight seal. We have sunk then in 8 feet of water overnight and they did not leak. While they were designed for 37mm rounds, they will be perfect for 26mm and other calibers.