The folding pattern, known as the Miura-ori, is a periodic way to tile the plane using the simplest mountain-valley fold in origami. It was used as a decorative item in clothing at least as long ago ...

It only takes three folds to get the job done and once it's complete, you won't have to roll up the top of your take-out or lunch bags anymore. It's surprisingly secure too, so you don't need to worry ...