A Real #13

I thought of a real #13 today. We save all of our Wal-Mart, Kroger, Target, etc. shopping bags and return them to Wal-Mart to be recycled. I would like to switch over the canvas bags, but it doesn't seem pratical for the large shopping trips I do. I do take a bag sometimes when shopping in the mall. But I don't feel bad about it since I know they can be recycled.