Opus Tactical Gear cases were originally spec'd for small arms and handguns, so they are built tough to withstand the elements. Nearly indestructible, these waterproof, airtight, dustproof dry boxes will protect your electronics, first aid, ammo, phones, GPS devices, and much more. Keeps water, dust, air, and corrosion at bay. When you’re on the go or need to keep valuables protected, use what the pros use….Opus Tactical Gear. O-ring seal and pressure release purge valve inclusivo.