Skyway Luggage Sigma 4 30 Inch 2 Wheel Rolling Duffel, Midnight Green, One Size 2-wheel cases are equipped with a high impact inline skate wheel system that ensures superior stability and smooth operation. The retractable pull handle is sturdy and lightweight for durability and reliability. With multiple locking stages, adjusts to the height that best fits your needs. Self-repairing nylon zippers with smooth-zip movement are easy to move, even when fully packed. Expandable cases allow you to gain increased packing capacity with the simple pull of a zipper. Elastic tie-down straps prevent items from moving during transit to help reduce wrinkles. Multiple mesh pockets and shoe pockets help keep your belongings organized. An adjustable add-a-bag strap lets you easily transport a second bag 5-year limited warranty