The reusable bags have a serious UX problem too. I have to buy as many reusable bags as my largest grocery order ever. Next, I have to carry all those empty bags with me throughout the store. Then, I have to launder my bags to get the inevitable nasty grossness out of them.

I wish they had a propane tank model instead: I buy reusable bag credits. At the checkout, my items are bagged from a supply of clean reusable bags, and that number is deducted from my credits (if I need more, I can instantly buy them). When I return to the store, I bring my bags back to the bag return where the bags will be laundered in bulk in commercial machines.