Most stores don't give bags here any more unless you buy them. I have a trunk for of reusable bags I take with me all the time, not to mention the two roll-up ones in my purse.
Our stores in town still supply plastic bags; if they started charging for them, people would get a lot more serious about remembering their reusable bags. Good idea about carrying a couple in your purse; once in a while I forget the reusable bags, but I never forget my purse!
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