Priority Mail

Priority Mail Shipping Boxes

1-3 Business Days1

Get more for your money with fast domestic service in 1, 2, or 3 business days1 based on where your package starts and where it’s being sent. Plus, discounts off retail prices may be available when you buy the service online.

Flat Rate Pricing2

No weighing or calculating needed up to 70 lbs. Flat Rate offers one rate to any state.

Ship Now Even Faster Shipping


  • Free Package Pickup3 service at your home or office
  • Includes USPS Tracking when you ship online and at retail4
  • Delivery in 1 to 3 business days.
  • Includes insurance5 with most shipments6 (restrictions apply)
  • No surcharges for fuel or residential, rural, and regular Saturday7 delivery
  • Flat Rate, regional, and prepaid pricing (retail only) available

See Insurance and Extra Services Details


Except for Priority Mail Flat Rate® supplies, Priority Mail® prices are based on weight and zone. And with Prepaid Forever® Priority Mail Flat Rate you get the same Flat Rate pricing with the added convenience of Forever postage.

Calculate expected domestic shipping costs for domestic shipments using the Price Calculators.
Calculate a Price

Additional Pricing Information

See Pricing Files
Calculate Volume Prices

Type Size Great for... Free Supplies8
Letter Envelopes 12 1/2" x 9 1/2" Letters
Order Now
Gift Card Envelopes 10" x 7" Oversized Greeting Cards
Gift Cards
Order Now
Window Envelopes 10" x 5" Pre-addressed Envelopes Order Now
Small Envelopes 10" x 6" Small Documents
Order Now
Padded Envelopes 12 1/2" x 9 1/2" Clothing
Boxed Jewelry
Order Now
Legal Envelopes 15" x 9 1/2" Legal Documents Order Now
Small Box

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

8 5/8" x 5 3/8" x 1 5/8"

Small Electronics
Order Now
Medium Box 1

11 1/4" x 8 3/4" x 6"

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

Office Supplies
Order Now
Medium Box 2

14" x 12" x 3 1/2"

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

Office Supplies
Order Now
Large Box

12 1/4" x 12 1/4" x 6"

12" x 12" x 5 1/2"

Order Now

12 1/4" x 12 1/4" x 6"

12" x 12" x 5 1/2"

Sending gifts to the troops Order Now
Large Board Game Box

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

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

Board Games Order Now
Prepaid Forever® Priority Mail Flat Rate® Packaging Various sizes available Various options Order Now

Priority Mail Regional Rate®

A low-cost shipping alternative for commercial and online customers who are currently using Priority Mail or Merchandise Return Service. With more than one size to choose from, the boxes combine the speed and convenience of Priority Mail shipping with zone pricing to reduce costs. Regional Rate boxes are best used for small, dense packages being shipped short distances.

Learn More

Priority Mail Open & Distribute®

Expedite the transportation of your bulk mailings with Priority Mail Open & Distribute. We use regular Priority Mail distance-based prices to quickly move your mailings at a reasonable cost. And with a special bar-coded label, you can track your shipment.

Learn More


Maximum weight is 70 lbs.

Maximum combined length and girth (girth is the distance around the thickest part) is 108".

When sealing a Flat Rate Envelope or Box, the container flaps must be able to close within the normal folds.

About Preparing Your Shipment


There are specific regulations and standards for mailing restricted, prohibited, and hazardous materials, including cigarettes and smokeless tobacco.

See All Restrictions

Packages shipped to a Military Post Office (APO/FPO/DPO) pay domestic prices, but require a customs form and have specific restrictions. In some cases, a Military Post Office may not be able to accept Priority Mail Express® packages.

Shipping to an APO/FPO/DPO Address