bumper sticker holder

Instead of attaching a permanent sticker to your bumper, just slide it into a clear plastic holder. It hangs from the rear window with hooks and suction cups so that it always hangs vertically in sloped windows. You can change the bumper sticker as often as you want.

PS/ As one can see by going to the link below, streetsmartholder, the problem with that is that design is that most rear windows are very sloped, so it's hard to read the sticker. A patent application for my idea has been submitted, Ronnie.