The Demise of the USPS Regional Rate - Is There a Substitute?
The US Postal Service confirmed it would no longer be making Regional Rate-sized boxes available to shippers once it does away with the service in January. That means sellers will have to look for alternative shipping services and supplies, with sellers probably looking first at Priority Mail (Flat Rate, Standard, and Cubic) to compare rates.
The USPS website explained that Regional Rate Boxes A and B were best used for small, dense packages being shipped short distances. ShipStation had compared the various flavors of Priority Mail in a post from July.
https://www.ecommercebytes.com/2022/11/16/the-demise-of-the-usps-regional-rate-is-there-a-substitute/
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My guess would be a lot of the flat rate products will be discontinued. Flat Rate Envelopes - does anyone send papers of any kind anywhere? And the small, medium, and large flat rate boxes are so expensive it's cheaper to use other methods. The USPS seems to me to be going out of the container business, slowly. Soon they'll charge for boxes as well as postage.