$26.50 for a legal-size flat rate envelope (15” x 9.5”).

$26.35 for a standard flat rate envelope (12.5” x 9.5”).

Flat rates are available for envelope mailings: Pricing for Priority Mail Express depends on the size of the letter or package. Priority Mail Express will deliver on the next business day in most cases, by 12 p.m. USPS Priority Mail time ships in one to three business days. It includes guarantees and can deliver on Sundays, holidays, and by 10:30 a.m. In terms of Priority Mail versus Priority Mail Express, the latter is one service level higher. Priority Mail Express is how the United States Postal Service offers guaranteed overnight delivery. Read on to learn more about the service, including how it compares to others available. USPS Priority Mail Express is a great solution when time is of the essence. You need to get your packages and documents where they’re going on time, but you don’t want to overpay. And when shipping packages, select First Class Large Package.A lot depends on your company choosing the right shipping method. We suggest you review your shipping process to keep your larger packages in the smallest box possible to avoid these surcharges. * Starting April 3, 2022, the USPS is adding new surcharges for large packages: That is the exact cubic dimension of your package. Multiply the Length, Width, and Height, and then divide that total by 1,728. For boxes that aren't square, measure the Length, Width, and Height of your box in inches. A 2 cubic foot square box is pretty big and well beyond the size of most packages being shipped. A square package 2 feet by 2 feet is 2 Cublic feet. A square package 1 foot by 1 foot is 1 cubic foot. * Calculating the cubic dimensions of your packages isn't difficult. And when shipping packages, select Large Package.

* Does not apply to First Class and Media Mail. Packages with missing or incorrect package dimensions that result in any dimensions-based fees, a $1.50 surcharge will be applied.If the volume of the package is greater than 2 cubic feet, a $15.00 surcharge will be applied*.If the longest side of a package is greater than 30 inches, a $15.00 surcharge will be applied.

If the longest side of a package is more than 22 inches but less than 30 inches, a $4.00 surcharge will be applied.* Starting April 3, 2022, the USPS is adding new surcharges for large packages*:

Usps priority mail flat rate envelopes