[adventureloop]

The Pirate Box[1] firmware is the perfect thing for this. The problem is finding power to keep the box running, but with wifi, you can hide the box somewhere out of site.

I have always thought it would be cool to set up a piratebox somewhere running from a solar panel. Then in daylight hours the dead drop would be there, but it would be gone at night.

[1]: http://piratebox.cc/

[rkda]

There's an Android version in case you have old smartphones lying around. They're more powerful than the OpenWRT routers and they do have their own power. You need to root your phone first though.

http://piratebox.cc/android