That's one of the reasons why I don't want a bag hanging on the back of a seat. It just seems trashy (excuse the pun) to have your garbage in the rear passenger's face.
The cloth bag on the side of the console that I use hangs beside the passenger's knee. Basically of out of sight. Not hanging in someone's face, not junking up and/or taking space in the center console. When it's empty it lays flat against the console so it's not in the way. I keep it empty. It's only there for temporary use. If we're driving somewhere and have trash for some reason it goes in the bag. As soon as we stop, the bag is emptied. I don't understand why some people (not saying anyone here, but people like that one nasty photo) hog their car/truck up. That's got to stink, and the clutter would drive me insane.