For some things like salad plastic bags make sense, because when you put salad in a plastic bag and close it and put that into the fridge, the salad will hold out longer than otherwise. And that is true for fresh salad from a farmer as well. A paper bag wouldn't work.
At the same time I would like to see stuff like fresh milk delivered by a milk man coming back in some way, because it's healthier (healthy). Pasteur, be gone. FRESH!