The B&W Foldon Box S is a polypropylene-sided, folding box for your folding bike! This box is a great way to protect your Brompton when checking it as baggage on a flight or even on the train or bus. The shell is made from ABS plastic, and it has 4 rolling wheels to help you get to your gate on time. It is lockable with a TSA padlock (not included), and it has padded handles for carrying up and down stairs. The internal dimensions are 25" x 24.4" x 12.4", the external dimensions are 26.6" x 28" x 13.8", and it weighs 11.9 lbs.