I didn't know this til just recently so I thought I would share to make life easier for others. USPS priority mail packages are free.(Boxes,envelopes,etc.) with your postage and you can also schedule a pickup at your door which is convenient for me because I live in a subdivision with a mailbox pod at the entrance.Nowhere to safely leave a package there for pickup. I have been going to the Post Office the whole time when I need to mail a package. Kinda makes the cost of priority mail worth the extra in my book plus tracking and delivery confirmation is free when you do it online. Thats all I have.Thank you