Priority Mail USPS is a service that includes tracking and delivery in 1-3 business days. Priority Mail USPS is a flat rate service lets you ship packages up to 70 lbs to any state at the same price.
Priority Mail USPS requirements are to have a maximum weight is 70 lbs and maximum combined length and girth (girth is the distance around the thickest part) is 108″.
When sealing a Flat Rate Envelope or Box, the container flaps must be able to close within the normal folds.
You can also use the dedicated Priority Mail USPS shipping calculator here.
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