Two – 12 packs of your favorite soda
One - 16 oz. can of “Great Stuff” (pressurized expanding insulation foam)
(You can substitute those nasty "plastic foam packing peanuts", or even use those plastic shopping bags that you've been saving and don't know what to do with).
Four - scrap washers, nuts and bolts per can.
Step 1: Making a better soda can for plinking, with a fitted carrier
Open the 12 pack carefully. Remove a can of soda. Drink the contents. Rinse the empty can, drain it and let it dry. Remove the pull tab. Repeat for all 12 cans in the case. Mark the case "MT" (Empty). Add the empty, dried cans back to the cardboard carrier. Repeat for the 2nd 12-pack.