USPS postage rates offer low-cost mailing and shipping prices for domestic & international customers. See Forever postage stamp prices and other postage rates.

Length plus girth combined cannot exceed 108 inches. (USPS Ground Advantage® cannot exceed 130 inches.)

Tracking and insurance are included, shipping boxes and envelopes are free, and with Priority Mail Flat Rate ®, you don't need to weigh shipments 70 lbs and under. Purchase Priority Mail postage and shipping labels at a Post Office or online.

A convenient alternative is Priority Mail Express ® Flat Rate Envelopes and Priority Mail Flat Rate ® Envelopes and Boxes. For one low price, you can mail any amount of material to a U.S. destination, of any weight up to 70 lbs that will easily fit in the flat rate envelope or box.

Item ID Value HS Tariff No Country of Origin Item Category Item Sub Category Action

Value-priced shipping with options for Flat Rate pricing or pricing by weight. Expand All

Use USPS Priority Mail Flat Rate packaging and pay one price: Pay the same price for mailpieces weighing up to 70 lbs going anywhere in the U.S. Use our Priority Mail Flat Rate Envelopes or Boxes that come in standard sizes so you don't have to worry about measuring them.

Maximum weight for First-Class Mail letters is 3.5 oz; for large First-Class Mail envelopes, the maximum weight is 13 oz. All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply.

Learn about USPS parcel size, weight, and fee standards.

Determine how much postage or how many stamps you need for your letter or package based on size, weight, and destination.