I agree this is a great idea. I have one suggestion. Paper grocery bags vary from store to store. Fred Meyer and Safeway paper bags are terrible, thin with no handles. Other stores such as New Seasons and Trader Joe's have sturdy bags with handles. I don't know if you want to dictate prices per bag by type, but you might want to include it in your discussions with grocers. My thinking is that if Safeway and Freddie's have to charge for their bags, they could provide better ones.