Very Light Proprietary Hpx2 Polymer Optimized For Air Travel Tough Double-throw Latches Automatic Purge Valve Balances Air Pressure Watertight O-ring Gasket Conic Curve Lid Shape Drop-tested On Concrete With Loads From 6ft On All Sides & Corners Submerged For 30 Min At A Depth Of 3.3ft Crushproof & Dustproof Stainless Steel Hasp Protectors Rubber Overmolded Handles Durable Quiet Rolling Stainless Steel Bearing Wheels Extending Trolley Handle Maximum Airline Carry-on Size Removable Polycarbonate Cardholder With Front Or Side Placement Model 1535 Internal Dim: 20.39"h X 11.2"w X 7.2"d External Dim: 21.96"h X 11.97"w X 8.98"d