Board Thread:Off Topic/@comment-26397825-20160424135023/@comment-26397825-20160517204018

Sheathes that are designed to be stored upside down tend to have a lock in place that holds the blade inside the sheath. In fact, most swords tend to have this anyway. It's why the fancy metal part at the top part of the scabbard, where the quillons meet the scabbard, is called a locket.