MTM Products S107411: With its water-resistant O-Ring seal and tongue and groove design, the Survivor Dry Box from MTM is designed for extreme environments. It also features a compass built in the lid, a signaling mirror, and triple latches for the best possible seal. This rugged all-weather box is tall enough to hold any non-handled Case-Gard 50 ammo box. It has lock holes and floats. Inside dimensions are 8.2\" x 5\" x 4.4\".