What Do You Do With Your Empty Packages?

I save any packing envelopes, boxes, etc. that I can when I get packages and mail. If they are in decent enough shape, I can reuse them to send out packages. I just carefully open the bubble mailer, USPS envelope, or box and then when I'm ready to mail something, I cover the old mailing stickers with the new mailing address and mail the package. I save money on packaging and I'm saving the environment by recycling :)