If people want to use fewer plastic bags, here's one way. When you buy a gallon of milk at a market, the store usually bags it for you. But really, why do you need it bagged, since it already has a handle? It's actually good exercise to carry it by its handle, rather than in a bag.
The fewer plastic bags you get, the less clutter in your house, and you save resources and de-stress nature. When you buy a gallon of milk, tell the bagger, “No bag.”