I just threw them in the back.
but I have got myself a bag for the half door uppers which I stow allt he windows in anyway .. no felt though.. but wouldnt be hard to add that.. best of all you dont fold or roll.. The roll idea is good except when I rolled them up for too long it was a real biatch to get them back on again.. maybe I was rolling them too tight.
The window bag is basic and as I said.. if you were keen enough your father in law could insert insert felt dividers..
not picking on your bag.. just making another suggestion in case he decides he want to make some money from jeepers