There's a hack that has made its way around the internet showing how to properly close a cereal box. After watching this video, you'll probably never close a cereal box the same way. How (We Thought) to Close a Cereal BoxUpon first thought you'd think you just have to put the tab in the slot. Danielle Danielle loading...WATCH: These Genius Kitchen Hacks Show We've Been Cutting Fruit WrongHow to (Properly) Close a Cereal Box HackFirst, tuck the side tabs in. As time goes on we find better ways of doing things, or just better things.