I filled it with Smarties. Every teacher wants a classroom full of Smarties.... right?
If you'd like to make this I used the template called Popcorn box available at the Silhouette Studio online store. I shrank it down a bit so that it would fit on 8.5 x 11 and still be able to have registration marks (since I used digital papers). I've also included a video to show you how to assemble.