For some locations ( from here in VA) it pays to "test" the box with weight VS flat rate. This past weekend I had to ship a bunch of boxes to TX, LA and FL. I knew FL would be better with priority mail by weight, but TX and LA can be iffy. However, all were a few dollars cheaper when shipping by weight. These were mainly smaller orders so all except 2 went in the medium priority mail container, 1 went in a shoebox and one in the large priority mail. I use mostly those 3 sizes of boxes. Anything west of the Mississippi it is usually cheaper to use flat rate boxes. And ( it took me a while) I finally wised up and started using click and ship and printing the labels here. That saves a bit, as you likely know.
