Hey Guys,
Here is the issue:
According to usps.com, Max. length 42 inches, max. length plus girth combined 79".
So, length + height x2 + width x2 must be smaller than 79".
Our common box size is 28"x16"x10" which puts us at 80". Those boxes get through with no problems. We mail at least 5 international a day, so our post office no longer checks the measurements.
I have many packages that slip through with a combined 100 inches length + girth.
No complaints yet, they gladly accept our money.