Cardboard box close clip

This may seem like almost a no design because of its simplicity, but it is fully functional. I re-use the cardboard packaging boxes that come with the many things I order online. They're usually quite strong and are ideal for keeping stuff like pencils, craft hand-tools, and other small stuff. But as I access the contents frequently, I don't want to have to seal the box every time, to avoid the flaps from remaining open. So I have created this closure clip which slides in between the two lon