I'd say another challenge with grociers is that each item is of such differnt size, shape, material. You have tiny flexible plastic bags, bananas, basil plants,

I'd say another challenge with grociers is that each item is of such differnt size, shape, material. You have tiny flexible plastic bags, bananas, basil plants, round glass beer bottles, self serve orange juice machines operated by third party companies, the meat and deli counter and so forth.