I found one of these last week... By far the smallest container I've ever seen (couldn't really imagine anything smaller though either)...
Pretty cool though!
These nano caches are popular in my area. I suppose they are available on Ebay with the right search words. Somewhere in this thread, I saw term "waterproof pill containers," but these are definately smaller. Will someone please identify the container by a searchable name? You could also add a link for purchase.
Thanks
You can find them for sale on eBay as: Tiny Magnetic Geocache - Nano Geocaching containers Item number: 150105128261