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 70 lbs. or less 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 $17.99 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. And you can easily track your Priority Mail packages with “one-click” tracking, eliminating the need to type in long tracking numbers to verify delivery.

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 $17.99 per month plus applicable taxes, if any, including the first month if you stay past the 4-week trial

*pay only S&H fee