USPS Priority Mail Flat Rate

usps-prioritymail

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 $20.99 plus applicable taxes, if any to use the service.
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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 : 
$7.99
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 : 
$8.27
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 : 
$8.74
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 : 
$8.51
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 : 
$14.38
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 : 
$14.38
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 : 
$19.51
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

Click “Get Started” to get access to all mailing and shipping services from USPS®, UPS®, and more. Get up to 89% off postage, schedule free pickups, and print stamps and labels 24/7.

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Print Stamps, Labels, Certified Mail®

We guarantee Stamps.com will change the way you send. You’ll have 30 days to use it to print postage from USPS, UPS, and more carriers, and schedule free pickups, all in one place.

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Don’t pay unless you stay

You can cancel any time within the 30-day trial period and pay no service fee. Your service will continue uninterrupted and you will be charged your first month if you don’t cancel.

Perks of your risk-free trial

  • Free mailing supplies
  • Free 5 lb digital scale
  • Free scheduled pickups
  • No contract, cancel any time