USPS Priority Mail Flat Rate Envelopes

You could save up to 57% by not using Priority Mail Flat Rate®

Priority Mail Flat Rate® is only cheaper than using your own packaging if you use Flat Rate Envelopes® or the Small Flat Rate Box®

Sand and shells coming out of a Priority Mail Small Flat Rate BoxPriority Mail Small Flat Rate Boxes
  • 📦

    Flat Rate is only cheapest in a few situations

    Flat Rate Envelopes® and Small Flat Rate Boxes® are good deals, but otherwise you should use your own packaging.

  • Delivered in 1 to 3 business days

    Flat Rate is delivered at the same speed as all Priority Mail® services, in 1 to 3 days to anywhere in the USA.

  • 📡

    Free package tracking included

    Priority Mail Flat Rate® comes with full tracking, so you and your recipient can keep track of the shipment.

  • 💵

    Priority Mail Flat Rate® is cheaper with Pirate Ship

    If you must use Priority Mail Flat Rate®, you'll save up to 12% by buying with Pirate Ship instead of at the Post Office®

Pirate Ship has the cheapest rates for Priority Mail Flat Rate®

Pirate Ship offers Commercial Plus Pricing® for USPS® Flat Rate services, which can save you up to 12% compared to the retail prices you'd pay USPS® at the Post Office® or on their website. With no markup or fees, Pirate Ship is 100% free.

Commercial Plus Pricing®
Savings from Retail Pricing in %
Flat Rate Envelope
$6.35
6%
Legal Flat Rate Envelope
$6.65
5%
Padded Flat Rate Envelope
$6.90
5%
Small Flat Rate Box
$6.85
5%
Medium Flat Rate Box
$12.45
10%
Large Flat Rate Box
$17.10
11%

Flat Rate® pricing makes shipping costs easier to understand,
but it's usually more expensive

The idea behind Priority Mail Flat Rate® is that if you can fit something into a Flat Rate-branded box, there’s just one price to pay, no matter how much it weighs or where it’s going. This simplifies shipping a lot, but that simplicity comes with downsides:

  1. You can’t use your own packaging, which can impact your customer's experience
  2. It can be up to 57% more expensive than using your own plain or custom packaging

Priority Mail Flat Rate® was really designed as a consumer product, and is not ideal for most business shippers. Even with Commercial Plus Pricing® shipping rates, there are only two types of Flat Rate packaging that are always a great deal: Priority Mail Flat Rate Envelopes® (including Priority Mail Legal Flat Rate Envelope® and Priority Mail Padded Flat Rate Envelope®) and the Priority Mail Small Flat Rate Box®.

For other sizes, such as the Priority Mail Medium Flat Rate Box® and the Priority Mail Large Flat Rate Box®, you could save up to 57% by shipping your items with Priority Mail Cubic® in your own comparably-sized packaging instead.

Priority Mail Flat Rate® is available in many different sizes

Priority Mail Padded Flat Rate Envelopes

Priority Mail Flat Rate® requires using Flat Rate-branded packaging, which you can pick up at any Post Office® or order online for free from USPS.com/supplies. There are 7 different Flat Rate package types, and some types come in multiple package sizes:

  • Priority Mail Flat Rate Envelope®
  • Priority Mail Legal Flat Rate Envelope®
  • Priority Mail Padded Flat Rate Envelope®
  • Priority Mail Small Flat Rate Box®
  • Priority Mail Medium Flat Rate Box®
  • Priority Mail Large Flat Rate Box®
  • Priority Mail APO/FPO/DPO Large Flat Rate Box®

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