Monolith - Shield 31 inch Luggage with TSA Lock Monolith Shield 31-inch Travel Luggage with TSA Lock Hard shell exterior for protecting your personal items; Retractable, height adjustable handle Interior zipper compartment with compression strap; TSA Approved Lock 360-degree gliding multi-wheel system; Ergonomic design for maximum maneuverability 31-in high X 21.5-in wide X 12.6-in deep