Not to mention that I prefer using my own bag(s) when I can, and whenever I go up to a manned checkout especially with a bagger and hand them my bag to use, at least half the time they start to panic as if they haven't seen this before, and then they're eager to start using the plastic bags after my bag is barely half full. This is even in stores that sell their own reusable checkout bags. At the self checkout, I can use my own bag worry-free and fill it however full I want, and if I overfill it, that's my problem and not on the store, so they don't have to worry either.