Pretty poor form by Amazon to send a News article on dimensional weight changes on the 1st March 2023 for them to apply on exactly the same date! Many sellers will be dramatically impacted by this. We have quite a few products where the Fulfillment fee has doubled (we sell some plant pots).
I know of sellers where their business, designed around Amazon’s Standard Sizes, will simply not exist anymore.
Supply chains are longer than 0 days. Would have been nice for this to be properly communicated in good time.
Poor form Amazon and you should rethink this as many categories will not be competitive vs. other channels.
Bye Bye Standard Sizes!