surely that is a good thing.
here in ermany plastic carrier bags cost ~50c, sometimes €1 depending on size of the bag.
lots of people here have a dedicated shopping bag. we've got a stylish cloth thing the GF sister got from thailand.
one big difference though is that in the UK people tend to do one big shop a week, whereas here we go shopping at least once every two days. and we got by foot. in the UK i think i almost always drove.
here kitchens are generally smaller (more flats than houses) and there are a lot more, yet smaller supermarkets everywhere (three with a five minute walk of where we live) unlike the UK. however UK supermarkets beat german supermarkets handsdown in terms of range of products (can't get rice here other than "boiled rice" unless you go to an asian place in the city), choice and opening times.
i guess boxes that fold flat would be better in the UK. more practical getting in and out of the car....
germany is relatively clean. don't often see carrier bags hanging in trees. hardly ever see a discarded plastic bottle. all plastic bottles here have a 25c refund on them. there are armies of poor OAPs collecting them in town.