Problem with reusable bags is that you have to have it on-hand. Fine if you plan your visit to the supermarket or have a car where you can always have a few stashed.

If you don’t have a car and only go to the supermarket occasionally on the way back from somewhere else you’re very unlikely to have a bag with you, so you end up buying the “reusable” bag every time and at this point I’ve thrown away several hundred of those over the last couple years as they accumulate at home and I have no use for them.