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.
Step 2: Making a better soda can for plinking, with a fitted carrier
For each of the 24 empty cans, carefully spray in enough Great Stuff (follow the label directions, especially about wearing plastic gloves, if you get this on your hands it can take hours to remove), to allow expansion to fill can, being careful to NOT overfill the can, as this will cause can to deform. Allow the foam to set for 24 hours. If you overfill, the foam will come out of the top of the can, and once set, will need to be sliced away. Once the cans are set (8 hours), return the foam filled can to the empty case. Repeat for all 24 cans.