The original shape of the bag is the result of precision studies in aerodynamics. Use of a special shock proof, heat and UV resistant material, makes the system particularly strong, lightweight and waterproof. The carefully designed embossed anti-scratch finish is extremely durable even after lengthy use. The exclusive MONOKEY device allows a single key to be used both to open the case and to detach the case from the bike. All cases are perfectly symmetrical & can be interchanged.