Elevated design and function. The Curio Book Opening combines the practicality of a soft case with the toughness of a hard case. It features huge packing volume with expandability on all sizes. The Duosaf ™ security zipper delivers top security, and the Optimov™ shock-absorbing wheels allow smooth rolling on bumpy surfaces. The recycled interior lining is treated with Microban® technology to eliminate the growth of bacteria.