Here's something I just found out about and wanted to pass on...
Flat Rate priority mail boxes that you can order from the post office off there web site.
The boxes are 11"X8.5"X5.5" you can fill them up and ship them for a flat rate of $7.70.... You order them for free...
Seems like a great deal for sending things to loved ones in the military......
+1. Been doing for months now with our 4x4 Club Resident deployed soldier.
Also, when you go to mail them, ask for more packages, they might give you a couple right there. Don't forget to the US Customs forms so you can fill them before you go the USPO.