Step 1: Supplies
Altoids can, ranger band or duct tape, and 2 rare earth magnets
Step 2: Placing Magnets
Place both magnets on opposite sides of the altoids can. The stronger the magnet the more weight you can put in the altoids can.
Now it is time to put things in the altoids can. Like keys, money, knife, ect.
Put a ranger band or duct tape around the outside of the can to make sure it stays shut.
Find a piece of metal on the bottom of your car to attach it to.