Step 1: Remove Deodorant Insert
So here my container is about 5 inches, and the deodorant is about 3 inches.
So 2 x 2.5 x 1.5 = approximately 7.5 cubic inches of storage (I cannot tell exact amount due to curves in tube, but this is an estimate)
Remember, you can increase storage space by cutting the bar down and shaping it to look like its normal.
Step 3: Store Your Goodies
You may want to wash the inside of the container out if you are storing something that could absorb the smell, or put that item in a plastic bag.
Now screw the insert back on, and there you have it! Last place anyone would look for your secret formula, or stash of a 16 million dollar diamond is in a stick of deodorant.
Here is your finished product, an innocent stick of deodorant containing your most prized possessions.