It is used to swap letters and postcards between geocachers!
Here is how it works:
Caches are placed to hold postcards. Each postcard will have a
short message and a forwarding address on it. The address will
contain the person's name that you are trying to send the postcard
to, their home city, and a destination cache. The idea is to move
postcards between Geo-Post Offices until they reach their
destination. When you move a postcard or message from one place to
another, let the person who it's being sent to know where you moved
it to, because they might be near enough to go and pick it up. If
you move a postcard from one Geo-Post Office to another, please
move it closer to the city or cache! You can send any message you
want to anyone you want!
How do you get started? Easy! Just write up your postcard and
drop it in the Geo-Post Office!
If there are any postcards in the cache when you arrive, feel
free to forward them on if you can. If not, don't worry, just leave
them for the next cacher.
The cache is a 1/2 gallon plastic jar. There are some trade
items in this cache, since the Geo Post ofices are new to the
states.But it has been placed for postcards and trackables.Please
don't feel that you have to run out and spend your hard-earned cash
on a postcard at the store. You can print and laminate a huge
variety of postcards off the internet.
Have fun!
Click here to visit a list of all the Geo-Post
Offices.