Product Detail 1680D Ballistic Nylon - Is a standard, even weave of durable nylon material orginally specified by the Federal Government for military use. The term "denier" (D) refers to the size of the yarn used: the larger the denier, the bigger the yarn. Carry On Sized - Luggage designed to fit in most airlines overhead compartments; may not conform to some airlines carry-on standards. Inline skate wheels - Are constructed of polyurethane with ball bearings to minimize frictional resistance, offer durability and reduced resistance for smooth rolling. Push button retractable handle - Locks when fully extended so you can push or pull your case. The handle also locks when fully recessed, greatly reducing the risk of damage when not in use. . The "Samsonite Business Cases Carry On Rolling Laptop Bag Grey" is best product for you. We recommended Samsonite Business Cases Carry On Rolling Laptop Bag Grey