I created this design to keep my son's baseball cleats with the rest of his gear bag. There's no room in the bag for his cleats but this keeps all the gear together and the mud, grass, and dirt on the outside of the bag. It simply slides over the end of his bat and the cleats hang on the hook. Problem solved.

UPDATE: I added a v2 Print Profile that features a longer hook that has more of a horn shape to keep the cleats from falling off.