Glasses Case based on Japanese tool box

Based on the Toolbox in Make: mag issue 34.
The lid is basically loose. You tuck one end into the box (the end with the longer tongue) and then slide it back until the other end of the lid hooks in. If that's not clear, there is an animation at http://makezine.com/projects/make-34/japanese-toolbox/

Thanks go to Len Cullum and Make: magazine