USPS Priority Mail: Regional Rates vs Flat Rate Green (dimensional)

Welcome to the USPS Priority Mail guide to domestic service and package rates. Learn how to use this guide.

In this guide, we compare specific USPS Priority Mail services: Regional Rate boxes and ShippingEasy's exclusive dimensional rates through Flat Rate Green. Learn about USPS Priority Mail. To make a comparison using this guide, you will need accurate weight and dimensions of the package you want to ship.

It is also important to note that Flat Rate Green rates are only available to specific ShippingEasy subscription plans: Plus, Select, Premium, Enterprise. Learn more about plan differences. Any ShippingEasy subscriber can access Regional Rate services.

Comparing Regional Rate and Flat Rate Green (dimensional)

Regional Rate Packaging

The USPS requires using specially marked Regional Rate boxes. Contents must fit comfortably in the boxes and packaging must be sealed without any bulging. Learn more about USPS Regional Rate packaging. No package may weigh more than 20 lbs and the Regional Rate Box A has a lower threshold of 15 lbs.

Flat Rate Green Packaging

Flat Rate Green gives a little more flexibility. Shippers can use their own packaging with the restriction that the package volume not exceed 0.50 cu ft and that no dimension is longer than 18 inches. Learn more about Flat Rate Green and dimensional pricing. No package may weight more than 20 lbs

If your packages exceed any of these, compare other Priority Mail options.

Comparing the Dimensions of Regional Rate boxes with Flat Rate Green

Regional Rate Box

Approx. Measurement Flat Rate Green Tier
Box A 0.2 cu feet Tier 2
Box B 0.4 cu feet Tier 4

Both Regional Rate and Flat Rate Green are zone based pricing, meaning that rates increase as the distance (zone) increases. Learn more about USPS zones. In general, you'll see the greatest advantage to Flat Rate Green for packages traveling further distances.

Detailed Service Comparisons

The tables below provide a visual summary of when it's best to use a Regional Rate box or a custom package with Flat Rate Green, based on weight and zone.

To simplify the data, we use a color and letter code to indicate the best packaging. Please keep in mind that services listed are only the best value when your products will fit into the defined package dimensions. Use the legend below to read the following charts.

Legend for Comparison Tables
Priority Mail Service Code Packaging
Regional Rate A Box A
B Box A or Box B
Flat Rate Green 1 Tier 1, only
2 Tier 1 or 2
3 Tier 1, 2, or 3
4 Tier 1, 2, 3, or 4
5 Tier, 1, 2, 3, 4, or 5

Regional Rate Box A - vs - Flat Rate Green (dimensional)

When your contents fit in either Regional Rate Box A or a custom package that's less than 0.2 cubic feet, choose your service based on zone.

If you are shipping items across the country, to Zone 5 or higher, Flat Rate Green (dimensional) rates will be a better value than Regional Rate Box A. Learn how to assign a package and dimensions to my shipments.

When shipping more locally, to Zones 1-4, Regional Rate Box A will yield greater savings. Learn how to assign USPS Regional Rate Boxes to shipments within specific zones.

Packages weighing between 15 and 20 lbs will not be eligible for Regional Rate Box A services.

Regional Rate Box A - vs - Flat Rate Green
Commercial Prices by Zone
Weight Zones 1 & 2
Local
Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8 Zone 9
Up to
15 lbs
A A A 2 2 2 2 2

Regional Rate Box B - vs - Flat Rate Green (dimensional)

When your parcels weigh more than 15 lbs, but fit within a Regional Rate Box A, use a custom package for dimensional rates through Flat Rate Green. Learn how to assign a package and dimensions to my shipments.

Regional Rate Box B - vs - all Flat Rate Green
Commercial Prices by Zone
Weight Zones 1 & 2
Local
Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8 Zone 9
Up to
20 lbs
B 2 2 4 4 4 4 4

When your contents fit in either Regional Rate Box B or a custom package that's between 0.3 and 0.4 cubic feet, choose your service based on zone.

If you are shipping items across the country, to Zone 5 or higher, Flat Rate Green (dimensional) rates will be a better value than Regional Rate Box B. Learn how to assign a package and dimensions to my shipments.

When shipping more locally, to Zones 1-4, Regional Rate Box B will yield greater savings. Learn how to assign USPS Regional Rate Boxes to shipments within specific zones.

Regional Rate Box B - vs - Flat Rate Green Tier 4
Commercial Prices by Zone
Weight Zones 1 & 2
Local
Zone 3 Zone 4 Zone 5 Zone 6 Zone 7 Zone 8 Zone 9
Up to
20 lbs
B B B 4 4 4 4 4

Continue Comparing Regional Rate boxes or Flat Rate Green (dimensional)

Consider the conclusions that you've drawn about your shipments and whether or not Regional Rate or Flat Rate Green are the better value. Then use this information to continuing comparing the best of the two with your other Priority Mail service options:

Regional Rate

Is Regional Rate a good fit for your shipments? If so, take a look at these other rate comparison guides:

Flat Rate Green (dimensional)

Is Flat Rate Green a good fit for your shipments? If so, take a look at these other rate comparison guides:

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