UPS will not accept packages addressed to FPO.

The package cannot weigh more than 70 pounds, and must not exceed 108 inches in combined girth (all the way around the center) and length.

Don't use wrapping paper if you can help it, and string will foul the postal machines. The post office recommends that you use the reinforced nylon strapping tape. Custom tariffs will have to be paid for all packages mailed to FPO.

Pack everything snugly so the contents don't move around, and try to distribute the weight evenly so one side is not heavier than the other.

Don't send anything that is highly perishable; there's no refrigeration available.

Although a 2-3 week space between mailing and receiving a package is normal, it could take as long as 6 to 8 weeks.

Don't send aerosols (e.g. shaving creams and spray deodorants) or liquids in glass containers.

Fireworks (and other explosives) are a no-no, even for the 4th of July.