F750 GS & F850 GS 19-20 (BLACK OEM PLASTIC RACK) Silver Astra Topbox KitCoocase ASTRA Basic topbox model specific kits are a sleek rounded design basic box looks better and is more durable than any other available at a similar price This S48BP is silver with smoked lenses, a large box that hides its bulk, with room for two extra large helmets and is 48 litres capacity. A padded inner liner is supplied to provide extra cushioning for helmets or other items stored in the topcase. The ASTRA Basic comes with manual key lock