The Sprinkler Hide-A-Key is one cool gadget that can hold more than one set of keys inside. The device looks identical to a sprinkler head and is water tight. Simply stow your extra set of keys and tuck it in the flower bed.
Make Your Own Hide-A-Key Glue a rock to the top of a empty pill bottle, bury the bottle so that only the rock shows. A spare key is hidden inside! - 15 Secret Hiding Places That Will Fool Even the Smartest Burglar OR it could be a Geocache!