You are correct Charles. These new rates are US Priority Mail shipments originating within the US headed for international destinations. QuietWorks LLC, manufacturer of the BLACKJACKET™ is in Idaho, USA.
A couple years ago, Priority International rates doubled for the "variable weight" packages I used to ship product, from roughly $12.95 to $24.95.
Now, since my product can fit in these new, small, standarized Priority Mail cardboard parcels, I can reduce my rates by at least $11--a savings of 12.5% off the total bill.