USPS Priority Mail Flat Rate

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What is Priority Mail Flat Rate®?

Priority Mail Flat Rate is a 1 to 3 day shipping service provided by the U.S. Postal Service (USPS) that features one flat rate for delivery of a package or envelope to its destination. The service allows a maximum weight of up to 70 lbs. for each envelope or package. Priority Mail Flat Rate® includes free shipping supplies available at the Post Office or sent directly to your residence or business for no charge. Packaging options include three types of envelopes and six boxes in various sizes.

An approved licensed vendor of the USPS, Stamps.com allows you to buy and print mailing and shipping labels for all USPS mail classes using a standard ink-jet or laser printer. There is a monthly service fee of $19.99 plus applicable taxes, if any to use the service.
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Try us out for 4 weeks!

Get $5 in free postage to use during your trial.

How to Send Packages with Priority Mail Flat Rate®

Shipping a package or envelope using Priority Mail Flat Rate® is very easy. Place your item in one of the many free Flat Rate boxes supplied by the USPS. As long as your item is not heavier than 70 lbs., you will not need to weigh the item.

Postage may be purchased either at the Post Office or online through an online postage provider. Once your package is ready to be shipped, you can schedule a free package pick-up from the USPS at your home or office.

Benefits Of Using Priority Mail Flat Rate® With Stamps.com

Following are the Priority Mail Flat Rate® options and specifications:

Priority Mail® Flat Rate Options

Maximum Weight

Outside Dimensions

Post Office™ Rate

Stamps.com Rate

Priority Mail® Flat Rate Options:

Flat Rate Envelope

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

12 1⁄2″ x 9 1⁄2″

Post Office™ Rate : 

$8.95

Stamps.com Rate : 

$7.75
Priority Mail® Flat Rate Options:

Legal Flat Rate Envelope

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

9 1⁄2″ x 15″

Post Office™ Rate : 

$9.25

Stamps.com Rate : 

$8.05
Priority Mail® Flat Rate Options:

Padded Flat Rate Envelope

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

12 1⁄2″ x 9 1⁄2″

Post Office™ Rate : 

$9.65

Stamps.com Rate : 

$8.45
Priority Mail® Flat Rate Options:

Small Flat Rate Box

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

8 11⁄16″ x 5 7⁄16″ x 1 3⁄4″

Post Office™ Rate : 

$9.45

Stamps.com Rate : 

$8.25
Priority Mail® Flat Rate Options:

Medium Flat Rate Box – Top Loading

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

11 1⁄4″ x 8 3⁄4″ x 6″

Post Office™ Rate : 

$16.10

Stamps.com Rate : 

$14.25
Priority Mail® Flat Rate Options:

Medium Flat Rate Box – Side Loading

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

14″ x 12″ x 3 1⁄2″

Post Office™ Rate : 

$16.10

Stamps.com Rate : 

$14.25
Priority Mail® Flat Rate Options:

Large Flat Rate Box

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

12 1⁄4″ x 12 1⁄4″ x 6″

Post Office™ Rate : 

$21.50

Stamps.com Rate : 

$19.20
Priority Mail® Flat Rate Options:

APO/FPO Large Box

Maximum Weight : 

up to 70 lbs.

Outside Dimensions : 

12 1⁄4″ x 12 1⁄4″ x 6″

Post Office™ Rate : 

$20.00

Stamps.com Rate : 

$17.70

Shipping with Priority Mail Flat Rate® boxes or envelopes using Stamps.com can save you money. Stamps.com customers save up to 10% off the Post Office rate each time they print a shipping label for a Priority Mail Flat Rate® envelope or box. Plus, Stamps.com offers insurance coverage up to $10,000. You can easily track your Priority Mail® packages with “one-click” tracking, eliminating the need to type in long tracking numbers to verify delivery.

Here's how it works...

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Open a Stamps.com account

Simply click the “Get Started”enter your promo code and click the “GO” button to sign up for Stamps.com and get access to all the services of the Post Office right from your computer 24/7. Even get discounts you can’t get at the Post Office!

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Try it out with $5 free postage

We’ll give you 4 weeks to see if Stamps.com is right for you. We’re so confident you’ll like Stamps.com, we’ll also throw in $5 free postage to use during those 4 weeks.

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Don’t pay unless you stay

Cancel your account online or call 1‑855‑608‑2677 to cancel within the 4‑week trial period and pay no service fee. The monthly fee is just $19.99 plus applicable taxes, if any, including the first month. Your service will continue uninterrupted as long as you do not cancel.

Free* 5 lb. Digital Scale with Sign-up

Every new customer account starts with:

  •  Free* 5 lb. Digital Scale with sign-up
  • 4-week trial
  • $5 in USPS postage to use in trial period
  • USPS rate discounts you can’t get at the Post Office
  • No long-term contracts, cancel anytime
  • Only $19.99 per month plus applicable taxes, if any, including the first month if you stay past the 4-week trial

*pay only S&H fee