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Priority Mail Flat Rate®

  

For your business.

With free shipping supplies, Flat Rate options, and no weighing or calculating, Priority Mail Flat Rate service is a simpler way to ship. And with delivery in about 2 days, Priority Mail Flat Rate Boxes and Envelopes are fast and affordable.

Still Have Questions?

Browse our FAQs ›

Image of 3 priority mail flat rate boxes and 1 envelope

Features

  • No weighing or calculating needed
  • Delivery within 2 days in most cases
  • Free Package Pickup™**
  • Free Delivery Confirmation™ when you ship online
  • Saturday delivery and residential delivery at no extra cost
  • The only 2-day service that delivers to mailboxes, mail slots, and PO Boxes™

Downloadable Pricing Files
Priority Mail - Commercial Base™
Priority Mail - Commercial Plus™
Priority Mail - Retail
Priority Mail - Commercial Plus Cubic

Compare other USPS® mailing and shipping services ›

Order Supplies Ship Online Now


Just select a Flat Rate Envelope, a prepaid Flat Rate Envelope or one of our 4 boxes. Each size has one low rate, no matter the weight.*  It includes free pickup at your door. Plus, when you ship online, you’ll get special savings and free Delivery Confirmation.

*Mailable items up to 70 lbs.
**For details on Free Package Pickup, go to www.usps.com/pickup.

See If It Fits!
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Service/Option

Size

Great for…

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Envelopes

 1(12-1/2" x 9 1/2" or smaller)

Documents
Manuscripts
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Gift Card Envelopes

 10" x 7"

Oversized Greeting Cards
Gift Cards
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Window Envelopes

 5" x 10"

Pre-addressed Envelopes
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Small Envelopes

 6" x 10"

Small Documents Passports
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Padded Envelopes

 12 1/2" x 9 1/2"

Clothing

Books

Boxed Jewelry
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Legal Envelopes

 9 1/2" x 15"

Legal Documents
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Small Box

 Outside:
8 11/16" x 5 7/16" x 1 3/4"

Inside:
8 5/8" x 5 3/8" x 1 5/8"

Brochures

Small Electronics
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Medium Box 1

 Outside:
11 1/4" x 8 3/4" x 6"

Inside:
11" x 8 1/2" x 5 1/2"

Office Supplies

Shoes
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Medium Box 2

 Outside:
14" x 12" x 3 1/2"

Inside:
13 5/8" x 11 7/8" x 3 3/8"

Office Supplies

Shoes
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Large Box

 Outside:
12 1/4" x 12 1/4" x 6"

Inside:
12" x 12" x 5 1/2"

Laptop Computers

Care Packages
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APO/FPO Large Box

 Outside:
12 1/4" x 12 1/4" x 6"

Inside:
12" x 12" x 5 1/2"

Sending packages to military personnel
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Large Board Game Box

 Outside:
24 11/16" x 11 7/8" x 63 1/8"

Inside:
22 11/16" x 11 3/4" x 3"

Board Games
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If It Fits, It Ships®* photo of express mail envelope Order free Express Mail® Flat Rate Envelopes *Mailable items up to 70 lbs.Priority Mail Stamps. Buy now photo of stamps showing the Mackinac Bridge and the Redwood ForestPriority Mail Flat RateTM Shipping. Get free Priority Mail® supplies> photo of priority mail boxes and envelopes

Businesses qualify for this pricing by…

  • Printing a label with postage on USPS.com®.
  • Using an approved PC Postage provider.
  • Using a permit imprint when a postal routing barcode matching the destination ZIP Code is on the mailpiece. Flat-shaped mailpieces with permit imprints may bear a POSTNET or Intelligent Mail barcode instead of the postal routing barcode.
  • Priority Mail Open and Distribute customers using permit imprint when a Service barcode containing a unique service type code 55 is on the address label.
  • Customers who pay postage using information-based indicia (IBI) postage meters in conjunction with an approved shipping label that bears a confirmation services barcode with a postal routing code.
  • Customers using USPS-approved IBI postage meters that print the IBI with the appropriate price marking ("Commercial Base Price," "Commercial Base Pricing," or "ComBasPrice") and who electronically transmit transactional data to the USPS and use an approved Priority Mail shipping label.
  • Permit holders using Merchandise Return Service (MRS) for Priority Mail mailpieces when all MRS requirements are met.

Existing Priority Mail customers qualify for this pricing by being…

  • Registered end-users of USPS-approved PC Postage products who qualify for commercial base prices and whose account volume exceeds 100,000 pieces in the previous calendar year or who have a customer commitment agreement with the USPS.
  • Permit imprint customers who qualify for commercial base prices and whose account volume exceeds 100,000 pieces in the previous calendar year or who have a customer commitment agreement with the USPS.
  • Priority Mail Open and Distribute (PMOD) customers who qualify for commercial base prices and whose account volume exceeds 600 PMOD containers in the previous calendar year or who have a customer commitment agreement with the USPS.
  • Permit holders using Merchandise Return Service for Priority Mail items who qualify for commercial base prices and whose account volumes exceed 100,000 pieces in the previous calendar year or who have a customer commitment agreement with the USPS.

Commercial plus prices are available for new Priority Mail customers who have a customer commitment agreement with the USPS.