With the holidays around the corner, package deliveries are ramping up around the country. According to one set of numbers, during last year’s holiday rush, deliveries in the U.S. nearly doubled from an average of 45 million to 95 million packages per day.

Even without the holiday surge, online shopping generates massive amounts of packaging waste. It isn’t just cardboard anymore — over the past couple of years, Amazon has increased its reliance on lightweight plastic mailers. About half of all e-commerce transactions take place through Amazon, so how Amazon chooses to ship its products has a big impact on what ends up in our landfills.

The new plastic mailers take up less space than bulky boxes, which allows Amazon to pack more of them into delivery trucks and planes. However, plastic mailers can’t be recycled as easily as cardboard. Like plastic bags, the plastic mailers tangle up sorting machinery at recycling facilities, causing expensive delays.

How can you recycle Amazon mailers?

If the mailer is plastic on the outside with a layer bubble wrap on the inside, or if it is flexible plastic (like a plastic bag) with no layer of bubble wrap: Bring it to a plastic bag drop-off. Just remove the paper label first, since the paper and adhesive can contaminate the plastic film recycling. If you aren’t going to take it to a drop-off, toss it in the garbage.

If the mailer is paper on the outside with bubble wrap on the inside: Because it’s made of mixed materials, it can’t be recycled at all. Reuse it or toss it in the garbage.

If you receive a cardboard box with plastic air pillows inside, flatten the box and put it in your Recycling Cart. Plastic air pillows can be treated like plastic bags — bring them to a plastic bag drop-off or toss them in the garbage.

How does plastic bag recycling drop-off work?

Certain big box stores and supermarkets put out bins for plastic bag collection near the front of their stores. Once collected, all of the plastic film is melted down and turned into materials such as composite lumber, which is used to make decks, playgrounds and park benches.

Ready to recycle those plastic mailers? Find your closest drop-off location.