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

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Welcome to the USPS Priority Mail guide to domestic service and package rates series. 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 more about USPS Priority Mail.

Overview of service comparison:

With either Regional Rate boxes or Flat Rate Green (dimensional rates), packages have specific weight limitations. No package may weight more than 20 lbs and the Regional Rate Box A has a lower threshold of 15 lbs.

In the case of Regional Rate boxes, the USPS requires using specially marked boxes. Contents must fit comfortably and packaging must be sealed without any bulging. Learn more about USPS Regional Rate packaging.

In contrast, Flat Rate Green gives a little more flexibility. Shippers 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.

To compare the dimensions of Regional Rate boxes with Flat Rate Green dimensions:

  • Regional Rate Box A measures approximately 0.2 cubic feet, the equivalent of Flat Rate Green Tier 2.
  • Regional Rate Box B measures approximately 0.4 cubic feet, the equivalent of Flat Rate Green 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 traveling further distances.

It's 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.

Detailed service comparison:

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:

TIP: 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 versus Flat Rate Green (dimensional) rates:

Regional Rate Box A vs Flat Rate Green

Prices by Zone: Commercial Plus
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
Take away:

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 B versus Flat Rate Green (dimensional) rates:

Regional Rate Box B vs all Flat Rate Green

Prices by Zone: Commercial Plus
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
Take away:

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 Flat Rate Green Tier 4

Prices by Zone: Commercial Plus
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
Take away:

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.

 

Continue comparing services:

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:

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

 


Related articles:

How to: Save a custom package
Best of Rules: Assign USPS Regional Rate Box to shipments with specific zones
What is Priority Mail Regional Rate shipping?
What is Flat Rate Green and does it relate to cubic pricing?
USPS Priority Mail: Guide to domestic service and package rates

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