Quite possibly, the best fly box ever. MFC waterproof boxes allow you to see your entire selection of MFC flies without opening your box. A stylish olive O-ring and a very strong snap closure combine to make this box completely waterproof. The trapped air inside allows the box to float and you a chance to grab it before someone else does. MFC's patent pending micro-slit foam provides a guide-hole allowing you to easily place flies into the slits, while also holding the flies securely.