I keep an EZE Lap diamond rod in my back pack and this is a kit I take with me when Camping and hunting. The Otter box holds a EZE Lap 210, super fine / medium metal cards for v grind, mouse pad backed with leather on both sides,sandpaper, and chunks of medium and fine rouge for convex edges. The leather pad sets on top of the box during use and the sandpaper can be wrapped over it closed upon by the lid.