I've got to agree with the "Micro" idea. The fact that you're looking for (and finding) something in an urban enviroment that 100, 1000, 10,000, or more people are walking by without ever knowing about is definitely wild.
> There was some discussion about micro caches on the Groundspeak forum > a few weeks ago. Current 'normal sized' caches range from 5 gallon > buckets down to sandwich size ziplock baggies. A micro-cache, imo, > would be something the size of a 35mm film tin. These would make > great caches for urban placement, however, clues to their location > would be paramount along with the GPS coords. Logbooks might consist > of rolled up paper. Hunters can bring their own writing utensils. > Items could be coins, pins, rings, etc. Personally, I think the > satisfaction of locating something this small on a planet this large > would be a blast. > > Matt >