The space for "accessories" is not really big - you can here might take an SD card or other small items, but certainly not great transport matters. By that I had expected, therefore no deduction from me.
The bag looks well made, is externally pretty hard, so no pressure on the screen is exerted even in tight spaces. Inside it is provided with a fabric cover, which also protects the display and the rest of the case. As I said, that fits well into Navi, does not slide around in it, but it can also be removed quickly.
For storage on the go and at home therefore ideal total.