My pre-schooler wanted to hide a cache,
and we decided to hide an easy one in a little piece of park land
in a nearby neighborhood.
You are looking for a magnetized sample/centrifuge tube covered in black tape.
Cache container is now a green-colored, magnetic nano.
He said that next time, he gets to hide a GI-NAKED ONE!
(That's gigantic in Kai speak)
Happy caching!