The Matrix 3-Piece SPinner Luggage set is constructed of rugged, brushed texture polycarbonate for years of travel. Soldi features are abundent across the sizes, like: A hidden compartment inside the expandable area on carry-on size only. Utility-hook for hanging articles such as small bags on the outside of case. Center strap hook for hanging articles of the front of case. Jumbo 8 wheel spinner with reduced noise and smoother glide. High quality aluminum locking handle system Expandable for additional packing capacity Built in TSA 3-dial lock system for added security Interior divider with zip mesh pocket and PVC pocket Buckle tie-belt to secure clothing Elegantly imprinted fully padded interior lining