emmie, as regards to bin bags, there are many items of bags of all kinds that the modern day would find it difficult to do without, but carrier bags is not one of them, as said in this post, its the easy one to do with out. You have lots of items in supermarkets ( food) that needs to be wrapped that's on sale.
There's lots of talk about supermarkets/shops selling loose ( unwrapped) food, this really is not an option in my view, they promote self service, therefore you have a very big health issue here, not everyone is fussy about keeping their hands clean when handling food, so infection could spread very quickly, could you really see supermarkets installing hand wash gel at the entrance, like hospitals, and even if they did would people use it?.
That said there are many areas were a big reduction of plastic can be reduced, for example I've just opened a plastic box of washing pods ( persil) the box is massive, but it only contains 15 pods, that only just cover the bottom of the box, this is to make you think your getting more for your money, there are thousands of items that are packed in over sized containers, just to fool us, you get a small slice of steak that's packed and displayed on a plastic tray that's 3 x bigger than the steak. disgusting and needs to be stopped. it makes me mad to see this happening.