Sturdy hitch cargo box. Aerodynamically, a cargo box is better than a roof box because it is protected behind the car and is not exposed to the wind in the same way. The result is less drag and less electricity/fuel consumption. The box's capacity is 400 liters (14 ft³) with a load weight of up to 50 kg (110 lbs). The durable, hard shell protects the cargo from dirt and water. The position of the towbar hitch makes it easy to load and unload the box. The space between the box and vehicle means you can still access the cargo area. l; license plate kit is provided to mount license plate on box in states that require it. A 7 to 4-pin wiring connector is required for lighting functionality on the box. This is not provided by Volvo and must be purchased seperately