100% polycarbonate which makes the case lightweight and durable. The case expands up to 2 inches for additional packing space * Features a large, convenient front pocket with integrated padded sleeve for up to a 15.6 inch laptop and 2 zippered mesh pockets for electronics, documents or any last minute items * The spinner wheels assure exceptional maneuverability and keep zero weight on your arm * The telescopic handle has been designed to fit in the palm of your hand, offering maximum comfort and control when pushing your luggage and less fatigue on your arm * Fixed tsa accepted combination lock provides a secure travel and allows only tsa agents to open and inspect your bag without damaging the lock