Re: What fraction of a gram ? @Duncan
Have you considered that they want something with a handle to carry them more conveniently with? Or to put other things in?Ah! Now I understand the downvote. I mean in the fruit aisle, not at the till.
Strangely, most of our supermarkets provide conveniently-placed trolleys for those who wish to grab a whole swag of stuff, and smaller baskets for those who only want to grab a few items. So as you mentioned, really no need for extra packaging. They also provide bags there so you can keep your loose tomatoes together, or protect your lettuce from your meat.
But then there are people who seem to be unable to figure out how to operate a shopping trolley or pick up a basket as they enter the store - perhaps some of them also had trouble working out which was the correct icon to click to upvote you? :)