I like the flat rate boxes, they keep things simple, for simple people like me. I like to use Priority Mail, one thing I think it pays to be mindful of, the most inexpensive rate may not necessarily be a good idea due to the way things are handled. Fragile items for example. Generally speaking, I think the faster an item travels through the system, the better overall. The situation to be avoided are large, heavy items like a huge box of Encyclopedias getting thrown on top of your box of antique figurines when thrown to the shipping containers. The lower tier postage rates are how the anvils, leaf springs, and rock collections get sent.
