Someone needs to tell the cashier that bringing your own bags isn't sanitary unless you wash them with every use, then the water use negates the savings to the environment. I need the plastic bags for picking up after dogs and various other non food uses, so mine are reused.
BTW, I see a lot more people of a mature age people trying to save the environment than younger ones around here. It bugs me to see anyone throw away aluminum cans, etc.