Quick Tools

Always a Click Away
Roll over the tools menu across the site to access quick, handy tools.

Priority Mail Flat Rate®

 

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.

Priority Mail Flat Rate Boxes and Envelopes

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 File
Priority Mail - Retail

Compare other USPS® mailing and shipping services ›

 

Just select a Flat Rate Envelope, a prepaid Flat Rate Envelope, or one of our boxes. Each size has one low rate, no matter the weight.* It includes Free Package 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 usps.com/pickup.

See If It Fits!
Try our Virtual Box Simulator ›

Priority Mail Flat RateTM Shipping.  Get free Priority Mail® supplies>    photo of priority mail boxes and envelopes Priority Mail Stamps. Buy now  photo of stamps showing the Mackinac Bridge and the Redwood ForestShip Online. Print a label with postage photo of computer printer with shipping label and brown box
 

Size

Great for…

Order Now

Envelopes

12 1/2" x 9 1/2"

Documents Manuscripts


Gift Card Envelopes

10" x 7"

Oversized Greeting Cards, Gift Cards


Window Envelopes

5" x 10"

Pre-addressed Envelopes


Small Envelopes

6" x 10"

Small Documents

Passports


Padded Envelopes

12 1/2" x 9 1/2"

Clothing

Books

Boxed Jewelry


Legal Envelopes

9 1/2" x 15"

Legal Documents


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


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


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


Large Box

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

Inside:

12" x 12" x 5 1/2"

Laptop Computers, Gifts, etc.


APO/FPO Large Box

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

Inside:

12" x 12" x 5 1/2"

Sending gifts to the troops


Large Board
Game Box

Outside:
24 11/16" x 11 7/8" x 3 1/8"

Inside:

23 11/16" x 11 3/4" x 3"

Board Games


Prepaid Priority Mail Flat Rate Packaging

Various sizes available

 


Learn More