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 /supplies. Priority Mail Flat Rate is available in many different sizes Even with Pirate Ship's BELOW 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.įor other sizes, such as the Priority Mail Medium Flat Rate Box and the Priority Mail Large Flat Rate Box, you could save up to 56% by shipping your items with Priority Mail Cubic® in your own comparably-sized packaging instead. Priority Mail Flat Rate was really designed as a consumer product, and is not ideal for most business shippers. View comparisons of Medium and Large Flat Rate Boxes vs. Priority Mail Express Flat Rate lets you ship packages up to 70 lbs to any state at the same. You get competitive prices and fast delivery every day, all year, with limited exceptions, to most U.S.

It can be up to 56% more expensive than using your own plain or custom packaging. Priority Mail Express service provides next-day to 2day delivery service by 6 PM with a moneyback guarantee 1.

You can’t use your own packaging, which can impact your customer's experience.

This simplifies shipping a lot, but that simplicity comes with downsides: 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. Flat Rate pricing makes shipping costs easier to understand, but it's usually more expensive

Flat rate usps box sizes