While by simple definiation, this works...

BUT then when you try to "purchase" a label, you have to scoll and scoll and scoll to Stamps.com (the carrier sould be it's own field) NOT buried in the endless scrolling. They really should be a button at the top, so you select the carrier, like in the old ship manager.  Really it seems that the development team is lost.
AND
The user should be able to HIDE package type they do NOT use.  to stop the scolling.