Rugged Design, Ultra-High Impact Polycarbonate Shell Open Cell Core with Solid Wall Design Double-Throw Latches Watertight silicone O-ring lid Large Fold down Over-molded rubber handles and stainless steel hardware Two Pad lockable Hasps Automatic Pressure Equalization Valve Chemical-resistant, Corrosion-resistant, Airtight, Watertight, Dustproof, Crushproof