Rubber gasket and liner protect the contents Strong latch design keeps contents in while keeping dust and moisture out Manual pressure relief valve allows easy opening after changes in ambient pressure Integrated strap slot allows to secure these cases to a tool box, back pack, bicycle and more Exterior Dimensions are 7.5" X 5" X 3.25" Approximate interior dimensions: 6 ¼” x 3 ½” x 2 ¼” The 22-25875 from Multicomp PRO is a black 6inch mini weatherproof case with rubber interior. This miniature weatherproof equipment case is ideal for use with portable electronics, small test instruments, jewelry and much more. It features a rubber O-ring that is integrated into the rubber lining that keeps contents secure while keeping water and dust out. Protective Case, Fit Use of Drones, Camera, firearms and ammo, GoPro, Camera Accessories, Equipment, Electronics, and Gear, Musical instruments and musical equipment, Laboratory instruments and lab equipment, Chemistry Equipment like microscopes.