"Compressible, easy to access, and instantly dividable, Peak Design Packing Cubes are functionally and aesthetically unmatched. A unique tear-away zipper lets you access contents quickly, unlike standard packing cubes with U-zip openings. An internal divider lets you separate clean and dirty clothes, and allows each compartment to expand/contract based on its contents. And, an expansion/compression zip provides additional space, or the ability to compress contents once packed. Outer shell is a beautiful, self-healing 70D nylon/poly blend. Available in Small and Medium sizes. Designed for use in any suitcase or bag, and sized to fit perfectly in any bag in the Peak Design Travel Line."