How Do USPS Priority Mail Rates Work?
USPS priority mail flat rate boxes can be a shipping marvel to your company. “If it fits it ships”. Anything you can fit into one the USPS priority mail flat rate boxes will ship to anywhere in the country for one flat rate. This only applies to the flat rate boxes, which you can get for free at any Post Office. You can also order them online and have them delivered to your home or business. Flat rate boxes come in three different sizes small medium and large. The medium size has two different shapes to accommodate different shaped products. Oh yeah, and they also have a flat rate envelope that will get to anywhere in the country in 2-3 days. So the question is how does the Post Office maintain a flat rate regardless of the weight? Priority mail flat rate boxes are rated according to the volume. The Post Office purchases space on a plane and charges for space on their trucks based solely on the volume that the box occupies. As long as the box is less than 70 lbs the rate will not chang
