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Flat Rate Shipping

USPS Priority Mail® Flat Rate Envelopes, Boxes & Mailers


Have you heard the phrase: "If it fits, it ships"?

Flat rate shipping with the USPS is as easy as it sounds! With flat rate shipping through the U.S. Postal Service, you can use Priority Mail® Flat Rate envelopes, boxes and mailers to pay just one flat rate when you ship up to 70lbs.

Flat rate envelopes and boxes are available in various standard sizes from the Post Office - at no additional charge. You can use shipping software and postage meter to calculate the exact cost. 

The heavier the package, the more you save! With flat rate shipping, the pricing is not tied to the weight of the package. It's tied to the size of the envelope or box and the service you choose. As long as your item fits in the Priority Mail envelope or box (but not over-stuffed!), you'll pay one set postage rate.


The Advantages of Flat Rate Priority Mail Shipping:

  • No weighing or calculating needed, up to 70lbs.
  • 1 to 3-day delivery, including Saturday and residential delivery at no extra cost
  • Includes USPS Tracking®
  • Free boxes and envelopes!
  • Free package pick-up
  • Overnight delivery available with Priority Mail Express® service
  • Up to $50 insurance with most shipments, $100 for Express (restrictions apply)
  • Service to everywhere

For more information, visit the USPS Priority Mail page



Priority Mail Flat Rate Products and Costs

The pricing for flat rate shipping depends on the size of the envelope, box or mailer. With Quadient, you can get access to even more shipping discounts and reduced postage rates called Commercial Based Pricing. This chart includes the current USPS flat rate shipping prices:

Product At the Post Office With Quadient
Flat Rate Envelope $9.65  $8.05
Padded Flat Rate Envelope $10.40  $8.80 
Legal Flat Rate Envelope $9.95 $8.35
Small Flat Rate Box $10.20 $8.55
Medium Flat Rate Box $17.10 $14.75
Large Flat Rate Box $22.80 $19.90
APO/FPO/DPO Flat Rate Box $21.20 $18.35


Priority Mail Express Flat Rate Products and Costs

Priority Mail Express® service ensures delivery within the next day to 2 days by 6 PM, backed by a reliable money-back guarantee. This chart displays the existing flat rate shipping prices offered by USPS.

Product At the Post Office With Quadient
Flat Rate Envelope $28.90  $24.90
Padded Flat Rate Envelope $29.45 $25.35
Legal Flat Rate Envelope $28.95 $25.15


Mail and Ship Like a Pro!

Speak to a Quadient specialist and discover the perfect mailing and shipping solutions for your business and budget.

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FedEx® and UPS® Shipping Rates

Get the low down on other carrier rates by visiting our Postal Rate Hub. Always have the correct postage rates right at your fingertips!

Go to the Hub


Still Using Stamps?

All-new Quadient Postage Meters meet the new Intelligent Mail Indicia (IMI) requirements. Make your job a whole lot easier and get yourself a meter today.

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