Peak Design Packing Cube (Medium) Review FirstSatyr March 9, 2019 March 9, 2019 No Comments on Peak Design Packing Cube (Medium) Review This fits your . Make sure this fits by entering your model number. Exterior fabric is self healing 70D Nylon/poly melange. Woven nylon webbing, Hypalon. Increase or compress space using expansion and compression zipper.