[SoftTalker]

I tend to shop at Aldi (US) and never seem to have a bag with me. I buy the paper bags for $0.10 or whatever they cost, then I reuse them for recycling until they tear or fall apart, then they get recycled themselves.

The bigger supermarkets (Kroger, etc.) all default to using single-use plastic. They will give you paper bags if you ask, and of course you can bring your own but it doesn't seem very common.

As long as the markets provide disposable bags free/cheap, people will tend to do that out of convenience.