As far as numbers four through seven, it depends on your local community rules. A number three denotes PVC, which Dorn describes as a particularly a problematic material to recycle. “If you look on the bottom of the container, the most recyclable plastics have a number one or two,” says Dorn. On plastic bottles, you’ll see a similar symbol that has a number inside: These numbers (one through seven) identify what type of plastic the package is made of. The paper and cardboard boxes that products come in are pretty much a sure bet, but look for the classic triangle with arrows symbol (which is called a Mobius loop) to be 100 percent sure.īut not every package with a Mobius loop is necessarily recyclable where you live. There are a few context clues on the package that tell you if it’s recyclable or not. Examine the labels on your products to see what’s recyclable.