Plastic #4 (LDPE) Put in Recycling Cart 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. Pay Attention to Proper Disposal Plastic #4 is a lightweight material that easily finds its way into the environment, where it can leach toxic chemicals. 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.