Priority Mail Flat Rate is only cheaper than using your own packaging if you use Flat Rate Envelopes® or the Small Flat Rate Box®
Flat Rate Envelopes and Small Flat Rate Boxes are good deals, but otherwise you should use your own packaging.
Flat Rate is delivered at the same speed as all Priority Mail® services, in 1 to 3 days to anywhere in the USA.
Priority Mail Flat Rate comes with full tracking, so you and your recipient can keep track of the shipment.
If you must use Priority Mail Flat Rate, you'll save up to 13% by buying with Pirate Ship instead of at the Post Office®
Pirate Ship offers Commercial 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 hidden costs or fees, Pirate Ship is 100% free.
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:
Priority Mail Flat Rate was really designed as a consumer product, and is not ideal for most business shippers. Even with Commercial 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 54% by shipping your items with Priority Mail Cubic® in your own comparably-sized packaging instead.
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:
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