USPS Priority Mail is a special shipping service provided by the USPS that delivers the packages in 1 to 3 days. Packages sent via Priority Mail are prioritized above other packages and are even delivered on Sundays.
Priority Mail service is available within the US only and includes a flat rate shipping, all over the country meaning that the shipping rate is the same for all the states. No weighing or calculating needed up to 70 lbs.
Depending on where the package is sent from and where it is being sent, it can be delivered in as fast as 1 day or may take a maximum of 3 days.