Plastic bags and plastic films are extremely difficult to separate from other recyclables at the processing facilities. These types of plastics get snagged on machinery and tangle up other materials.
Many plastic bags and films are recyclable, but they must be collected through a separate, dedicated system. You can recycle your plastic bags at most local grocery stores. The most common thing that bags are turned into is plastic boards like the kind outdoor plastic decks and park benches are made of.