I'm looking to build a kit around the maxpedition 3x5 notebook holder which features four external pen slots on one side. It has me thinking...I only carry a Parker Jotter with a Fisher insert usually, what other thin tools could fit inside pen slots? Any very thin but usable LED lights? Hand tools? Carriers for smaller objects? Trying to brainstorm what else could go in a pen slot besides a pen. ...Besides a pencil. Beat you wise crackers to it.