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Four extra-deep base-to-lid locking cleats that ensure maximum stacking stability. Watertight, crushproof, and dustproof. 6-piece foam set. Lifetime Guarantee of Excellence. O-ring seal. Open cell core, polymer wall construction. Stainless steel hardware and padlock protectors. Two Integrated Automatic Pressure Equalization Valves. Two rugged double-wide handles. Wide-track polyurethane wheels with ball bearings and nylon hubs.