Exterior fabric is self healing 70D Nylon/poly melange. Woven nylon webbing, Hypalon. Exterior fabric is self healing 70D Nylon/poly melange. Woven nylon webbing, Hypalon. Capacity Small: 4.5L to 9L max Ultra-fast tear-away for main opening. Access secondary opening via straight zip for dirty clothes storage. Peak Design Small Packing Cube 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.