
To ship via Flat Rate, you need to use the Flat Rate branded boxes. It’s cost-effective and encompasses three widely-used shipping options: Priority Mail Flat Rate (which we discussed above), Priority Mail weight-based, and Priority Mail Cubic. USPS Priority Mail is one of the most popular service levels the Postal Service offers, and for good reason. 2023 USPS Priority Mail Flat Rate Shippo vs. Sign up for a free Shippo account, to see live discounted rates and print USPS labels for Flat Rate Boxes. On top of this, Shippo merchants get access to special pricing on Priority Mail Flate Rate services during peak season. What are the 2023 USPS Flat Rate Box Sizes and Prices?Īs you’ll see below, Shippo offers discounted shipping rates when compared to what you’d find at your local Post Office. Bonus! Determine if a USPS Flat Rate box is the cheapest option for the items you’re looking to ship, since it’s not always the most affordable choice.

