Samsonite Luggage Vizair Laptop Backpack (One size, Black/Electoric Blue) 1680D 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 the yarn size: the larger the denier, the bigger the yarn. Smart Sleeve - Feature allows case to slide over the Upright handle tube for easy transport. Top carry handle - Allows you to lift the case with ease and comfort, or carry it by hand when rolling isn't an option. Laptop compartment - Is a built-in padded compartment designed to carry your laptop computer and help protect it from shocks while traveling. Padded shoulder strap - Are designed for comfort and ease of carrying. Non-slip shoulder pads attached to the strap disburse weight more evenly on your shoulder while you travel. A swivel clip at the end of the strap helps prevent twisting.