You've got to charge enough for it to be a disincentive. In the UK, I did not change my behaviour at 5p a bag but at 30p a bag I did. I keep couple of foldable

You've got to charge enough for it to be a disincentive. In the UK, I did not change my behaviour at 5p a bag but at 30p a bag I did. I keep couple of foldable bags in my laptop bag and it works great - zero downsides. It was frustrating to begin with but now, if anything it's entirely positive - less hassle relying on a shop's bags and I like the continuity of using my own - so I give such schemes a thumbs up. The resistance is about habit changes rather than actual lifestyle impact.