The compressor keeps the leading edge plastic profile battens concertinaed in the same way Ozone packs the kites in their factory. It requires a little more time to pack a kite, however we highly recommend using it as this protects the kite and the Leading Edge battens from potential deformation. Light weight materials, internal compression straps and a breathable mesh lining keep weight and packing size to a minimum - perfect when traveling with multiple kites. The Closed Cell Compressor bag is specially designed for our high performance foil kites such as the R1, Chrono and Hyperlink. SMALL: 5m - 9m MEDIUM: 10m - 13m LARGE: 15m - 21m