Watertight O-ring sealnThree tight locking latchesnReinforced lids and bottom to prevent flexingnZerust corrosion protectionnOpen core designnThe Ultimate Tuff 'Trainer box to make sure your items stay dry. Watertight O-Ring Seals the lid to keep the moisture out. Zerust Corrosion Protection to Help with Moisture inside the box.3 Tight Sealing Latches.