smartwork - 5:26 am on Jan 1, 2010 (gmt 0)
We tested Flat Rate Boxes years ago, and there were only about two products that we had that were small and heavy enough to make the boxes/rates work. Other than those, every time we would have over-paid if we had used them. They are probably just the ticket for those who want to focus on convenience and not maximizing profit. If anyone is exploring USPS and hasn't heard of Endicia, you may check it out.