If you use envelopes, buy recycled paper-only envelopes without any plastic window. Some recycling facilities can still recycle an envelope with a plastic window, but you would have to check with your recycle company. But it certainly doesn’t help since they need to have the technology to remove it. Some people take the time to cut out the plastic window, which is annoying to have to do. So, let’s just not have any plastic windows on our envelopes. This way, they can definitely be recycled.