I previously had tried the USPS online Services and it was pretty out dated technology. I tried it again today and it's now a money saver. I had to mail a 3 pound 6 ounce package of MTs to a MT.org member. I had a flat rate Priority Mail box here and decided to give it a try. Well to start off if you print your USPS shipping label ( .pdf format), for Priority Mail you receive a $1.00 discount and FREE Delivery Confirmation. That was a 17.5% discount over what I would have been charged if I drove to the PO to mail it. I attached the mailing label ( .pdf format ) with tape and gave it to my mail person and they took it to the PO for me. Another benefit is the Priority Mail boxes are free in various sizes.