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. Laptop compartment - Is a built-in padded compartment designed to carry your laptop computer and help protect it from shocks while traveling. Tablet Pocket - A compartment designed to store your tablet. Contoured Straps - Are designed for comfort and ease of carrying. Contoured non-slip shoulder pads are ergonomically designed to disburse weight more efficiently on your shoulder.