This argument is so absurd. I have reused my reusable bags more times than I can possibly count. It's really not hard or unrealistic. How does everyone else seem to have such a hard time with this?
To pile on here. I reuse my reusable bags hundreds if not thousands of times. I purchased a set of high quality bags that stuff into a small bag. They are better in all ways than any other bags I've used. The ergonomics are excellent.