Us Postal Rates Flat Envelope 2025. You can send up to 4 lbs using priority mail international flat rate envelopes and small flat rate boxes, and up to 20 lbs. The price of regular first class postage will not change on january 19.
Washington — today, the postal service filed notice with the postal regulatory commission (prc) for shipping services price changes to take effect january 19,. See forever postage stamp prices and other postage rates.
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