Samsonite Lift2 Duffel Boarding Bag (16", Black) 400D x 360D Polyester - Is a man-made fiber produced by the polymerization of the product formed when an alcohol and organic acid react. Loosely defined, denier (D) refers to yarn size: the larger the denier, the bigger the yarn. 400D Ripstop Poly - Ripstop Poly is Combination of rugged Ripstop Polyester and Nylon for durability. Extra strength fibers are woven into fabric at specific intervals to provide exceptional tear strength in a light weight material. Removable shoulder strap - Are designed for comfort and ease of carrying and are easy to remove and store when not needed. Non-slip shoulder pads disburse weight more evenly on your shoulder. A swivel clip at the end of the strap helps prevent twisting. Large main compartment provides easy access to contents. Convenient side pockets for water bottle and any additional last minute items. Front pocket organization for all of your travel needs.