How to select large envelope?

[kingsriverboy]

I recently purchased large very thin plastic envelopes for shipping items such as a shirt. I don't see how to select that as measure and weight for shipping? Any help for someone wincing at their own stupid question appreciated...)

[disneyshopper]

Select package.  Enter the weight and dimensions of the package with the item inside.  You will most likely select Ground Advantage as the shipping method.