Anyhow, I guess the problem is people are disposing of the re-usable bags too quickly? Well look at Austin's legislation: they're missing the nominal mandatory per-bag fee that San Francisco imposed (10 cents). It's not about the money, it's just how people think: if they must pay for something, they assign it higher value, and are less liable to throw it away [0] [1]
[0] https://www.washingtonpost.com/news/wonkblog/wp/2014/11/13/t...
[1] (HN comments on [0]) https://news.ycombinator.com/item?id=8602502