Previously I've made a compact style 9 volt battery laser pointer. I felt like it wasn't compact enough, and so this re-design enhances the compactness.

This casing is designed for 6mm diameter laser pointer, push button switch & button style battery like CR2032.

Push button switch & the battery holder should be glued on to the casing to held it in place.

Use screws to keep the lid and the case together. There's another version with holes added for wrist strap.