It’s a Soda Pop Stopper!
Remember when soda came in glass bottles instead of plastic? The “clink” sound made was much more satisfying when cheering with a friend, but saving the rest of your soda wasn’t as easy as putting the cap back on. That’s why we used soda pop stoppers! Made out of metal and plastic or rubber, all you had to do was stick the cork into the bottle and secure the metal, and voila! Your soda can be saved for days to come.