Inspired by that great scene in National Lampoons Vegas Vacation when they have to search for buried cash.

Great mason jar lid that looks like a rock. Printed with supports at 65% angle so it only did inside but may want to do a custom support in the middle it doesn't need on the sides but still tried to put them. Grab a jar, insert your valuables, put on the lid and bury up to the rock. Now you know where your “stuff” is without anyone else knowing. 

It works with the lid insert so can keep water tight. My wife wouldn't let me dig a hole in her garden but little does she know i did it anyway lol. Enjoy and please share your makes