GoPro Hero 2 motorsports and this Silicone Case

Since I use the camera for the purpose on the vehicle, a small protection should protect the expensive Housing of GoPro. I use the same however the Wifi Backpack underneath what a little cruelty is the "installation". The casing is designed for the pure device to the standard Housing (but since I want to protect the device while driving, the manufacturer should there me the extension for a Backpack go one step), which is why only 4 stars. Long-term experience is lacking, because I got the envelope just now and could not test, but for the few euros this silicone case to protect the device and if it is broken, there is just a new. 2x Silicone Case 1x = new housing, then prefer the silicone shell and if you hold, I'm happy!