Hello A110Ge,
thanks, but I had looked at the HillsAlive bags (you may notice that I started the other thread as well). They look nice, but are also pricey. I have found another solution. Actually a simple sports bag did the job

Now I am looking for an extra bag to be put on the luggage rack.
Even so some of the leather suit cases look really nice and give the car a period look, I prefer to have a more flexible and less heavy solution.
I will give the Boot Bag a try.