Here's how to make a diversion safe to store/hide small valuables or cash.
This version has a screw-off bottom, so that the whole thing can be picked up without falling apart and plaster makes it of comparable weight to its original contents to fool those that pick it up.
Step 1: What you'll need
Epoxy (preferably quick-setting)
Plaster of Paris
Soup can or other type of can
Small(er) plastic jar with threaded lid (with label removed for mildew resistance)
Side-cutting Can Opener (did I mention it HAS to be a side-cutting type?)
Several hundred dollars in cash
Hungarian Vizsla (optional)