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Flats
Valid Flat Dimensions
Property Minimum1 Maximum
Length 11-1/2 inches 15 inches
Height 6-1/8 inches 12 inches
Thickness 1/4 inch 3/4 inch

1. Flats exceed at least one of these dimensions.

Mailing Services Content
Priority Mail Express

This 1 or 2 day service includes tracking, proof of delivery, and insurance up to $100 with a money-back guarantee. Additional insurance up to $5,000 may be purchased for merchandise. Sunday, holiday, and early in the day delivery is available to many destinations for an additional fee.

Scheduled Delivery Day: 1 or 2 Days

Priority Mail Express Commercial Base prices apply to:

  • Customers who use an USPS Corporate Account (USPSCA), including Federal Agency Accounts.
  • Registered end-users of PC Postage products when using a qualified shipping label.
  • Customers who pay postage using Information-Based Indicia (IBI) postage meters when using a Priority Mail Express shipping label.

Priority Mail Express Commercial Plus prices are available to the following new and existing customers that meet specific volume thresholds or customer agreement requirements:

  • USPS Corporate Account (USPSCA), including Federal Agency Accounts.
  • Registered end-users of USPS-approved PC Postage products when using a qualifying shipping label.
Priority Mail

This service is typically used to send documents, gifts, and merchandise.

Expected Delivery Day: 1, 2 or 3 Days

Priority Mail Commercial Base prices apply to:

  • Registered end-users of USPS-approved PC Postage products when using a qualified shipping label.
  • Customers who pay postage using Information-Based Indicia (IBI) postage meters (in conjunction with an approved shipping label that includes a confirmation services barcode with a postal routing code).
  • Permit imprint.

Priority Mail Commercial Plus prices are available to the following new and existing customers that meet specific volume thresholds or customer agreement requirements:

  • Registered end-users of USPS-approved PC Postage products when using a qualifying shipping label.
  • Permit imprint customers
  • Priority Mail Open and Distribute customers
PMOD

Priority Mail Open and Distribute (PMOD) expedites the transportation of bulk mailings by using Priority Mail to quickly send the mailings to a destination delivery unit for processing. Because it has a special bar-coded label, USPS.com can be used to track the shipment.

Prepare your mailing according to the standards for the enclosed class of mail, put it into a USPS-approved container, include the appropriate tag or label, and bring it to a USPS® Network Distribution Center, Sectional Center Facility or Destination Delivery Unit. The postage price will be based on the weight of the contents (excluding the tare weight of the external container) and regular Priority Mail distance-based prices, so your mailings move faster at a reasonable cost.

Create a Priority Mail Open and Distribute Service address label in any of the following ways:
  • Register and download the USPS Shipping Assistant® free desktop application.
  • Choose a shipping service software provider from the list of companies that have met Postal Service™ specifications for the electronic file and barcode.
  • Register and integrate the USPS Web Tools™ Ecommerce API.
First-Class Mail

This service is required for personal correspondence, handwritten or typewritten material, and bills or statements of account. It may also be used for any mailable item including advertisements and lightweight merchandise.

500 or more pieces required for Automation and Presorted prices.

Maximum weight: 13 ounces

Expected Delivery Day: 1-3 days

Annual mailing fee is required for automation and presorted prices.

USPS Marketing Mail

Flats containing mailable items not required to be sent as First-Class Mail may be sent as USPS Marketing Mail. USPS Marketing Mail is typically used for advertisements and flyers. Additional content restrictions must be met for authorized nonprofit mailers.

200 or more pieces or 50 pounds required per mailing.

Expected Delivery Day: 3-10 days

An annual mailing fee is required.

Every Door Direct Mail (EDDM)

With Every Door Direct Mail® service from the U.S. Postal Service®, you can reach the customers who matter the most to your business in nearby neighborhoods. You don't even need to know names or street addresses. Simply identify the neighborhoods you want to target and your printed piece is delivered to every active address in your target area. And now, with demographic filters, your mailings can be even more targeted to the customers you want to reach.

Choose the option that is best for you.

  • Every Door Direct Mail – Retail® – Most local businesses choose this service because it's our simplest, most cost-effective option. Every Door Direct Mail — Retail® lets you send up to 5,000 mailpieces a day per ZIP Code. And, using the approved Every Door Direct Mail — Retail Indicia, you don't need to purchase a postage permit.
  • Every Door Direct Mail® – This option is designed for businesses that send larger mailings using a mailing permit. With this option, you need a postage permit and entry into a Business Mail Entry Unit (BMEU). This option is great for announcing new store openings, sales, or other major events. You can also reach homes during the week for a weekend event. And, there's no need to print names and addresses on every mail piece

Bound Printed Matter

Contents are limited to permanently bound printed sheets of directory, advertising, or editorial matter, such as catalogs or phone books.

300 or more pieces required for Carrier Route and Presorted prices.

Expected Delivery Day: 2-8 days

An annual mailing fee is required for destination entry prices.

Media Mail

Media Mail contents are limited to books, manuscripts, sound recordings, recorded videotapes, and computer-readable media (not blank). Formerly called "Book Rate," Media Mail cannot contain advertising, except books can contain incidental announcements of other books.

300 or more pieces required for Basic and 5-Digit prices.

Expected Delivery Day: 2-8 days

An annual mailing fee is required.

Library Mail

Library Mail is generally used by qualified libraries, schools, nonprofit organizations, universities, and museums to mail specific types of Package Services matter that meet additional eligibility standards. Mailable items are limited generally to books, recordings, educational, and museum materials; advertising restrictions apply.

300 or more pieces required for Basic and 5-Digit prices.

Expected Delivery Day: 2-8 days

An annual mailing fee is required.