Plastic #4 (LDPE) Recycle Curbside Too Thin to Recycle Plastic films, such as plastic bags, plastic wrap, frozen food bags and many other plastic #4 items, are too thin to recycle with hard plastics. Find out how to dispose of plastic bags. Help Prevent Litter Plastic #4 is a lightweight material that easily finds its way into the environment, where it can leach toxic chemicals. Dispose of it properly to prevent it from becoming litter. Did You Know? What Plastic #4 Can Become Plastic #4 can be recycled into shipping envelopes, paneling, tiles, plastic lumber, trash can liners and trash cans.