Porsche has been making roof boxes for its cars for a few years now, and the latest is their most technically advanced ever.

Designed by Porsche Tequipment in cooperation with Studio F.A. Porsche, it started life as a simple design sketch before being turned into a 1:1 clay model.

Subsequently, they proceeded to test it in the wind tunnel, making adjustments, and it was then subjected to endurance trials in the Porsche Development Center in Weissach. The automaker claims that the roof box can withstand tough conditions on the road and track and has been tested at speeds of up to 200 km/h (124 mph).

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“In addition to the permitted speed, the individualization options for the roof box will also be unique”, said Porsche’s VP of Individualization and Classic, Alexander Fabig. “Like the box, the side blades are available in High-Gloss Black and three other popular colors from our model range: Dolomite Silver Metallic, Carrara White Metallic and Volcano Grey Metallic.” Optionally, the side blades can be primed or painted in the same color as the car.

Porsche Tequipment’s new roof box, which is accompanied by three securing straps, protective cover with the automaker’s logo, two pairs of gloves and Porsche Crest sticker, can be mounted on all base carrier roof transport systems. It uses a quick-fastening system, can be opened from both sides, has a 480-liter (17 cu-ft) capacity and supports a maximum load of 75 kg (165 lbs). It measures 212 cm (83.5 in) in length, 92 cm (36.2 in) in width and 44.5 cm (17.5 in) in height.

The roof box will become available starting this month, at a net price of €1,150 ($1,383) in Germany. The primed and colored side blades will set customers back another €200 ($240) or €350 ($420) respectively.