Just an FYI as this is not posted anywhere on Global Post, Stamps, or Shipstation.
"GlobalPost Standard Intl" is now charging by DIM weight for small packages. There is no minimum size, ALL packages will be priced by size. And their pricing is outrageous.
So if you ship a small 6oz package, and the dimensions are 6x6x3 (a very small sized package) you will get charged as 6x6x3÷166 = 0.65LBS/10.4oz. Which will knock your package to the next price tier which can be $7-9 higher.
Meanwhile, the regular GAP global post packages are not affected.
