GV700 GV650C CLASSIC 10-17 Silver Astra Topbox KitCoocase Astra Basic topbox model specific kits are the tardis model, they simply hold more and look smaller than any others quoting similar capacity. This S48BP has silver lid 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 can be purchased as an accessory to provide extra cushioning for helmets or other items stored in the topcase. The Astra Basic comes with