I am curious how this would work in Japan. Walking through a grocery store or a convenience store most tea and soda is in plastic. I suppose that could be glass but carrying home several litters of liquid is already heavy enough with out adding glass. (most people walk to the grocery story so they have to carry stuff home).
Most yogurt is in plastic. Putting that in ceramic or glass seems out or similar reasons.
All bread products are wrapped in plastic. There used to open bins in the "bakery" area but because of covid-19 every pastry, bagel, croissant, etc is not individually wrapped in plastic. All chips and crackers are in plastic. I'm not 100% sure they can be wrapped in paper given how humid it is. Maybe wax paper?
Milk is almost universally in cardboard though 80-90% have a plastic cap. I'm not sure that the cardboard isn't plastic coated though. It certainly feels like it is but maybe that's some kind of wax?
All meat is in styrofoam trays (plastic) wrapped in plastic. I don't know if they could wrap it in anything else as people want to see it before buying (paper is opaque) and having a butcher counter would be much slower having to wait in line for the butcher.
All cheese products are in plastic. Same as the butcher, I can imagine a cheese counter where they wrap the cheese in paper but no one wants to wait in line and plastic wrapped cheese lets me see the cheese.
Japanese pumpkin is often sold in quarters because a single pumpkin is too much for one. Those are wrapped in plastic. Not sure what else you could wrap them in and leave them on the counter for a day. I suppose you could require to people to buy whole pumpkins.
All tofu is sold in plastic.
I'm also not sure what to do for garbage. Japan, or at least my area, requires garbage to be put in vinyl bags. It arguably helps putting out a bunch of food stuffs to not just be open and lure for rats and bugs so I'm not sure what we could switch to there.
Well, there is definitely lots of room for improvement. At least in July they finally made stores require to charge for plastic bags and ask if you want one (not just auto charge you). I'm not sure how affective it is but it did manage to change my behavior. I carry a reusable bag now.