Outfit a mason jar with a Cruet Lid to keep oils or sauces on your counter, or a Syrup Dispenser Pump Lid for sweeteners and flavored syrups (you can also add a pump to repurpose a jar as a soap ...

That is, it should be designed so that one of the two sizes of Mason jar lids will fit on it properly and, most likely, not accidentally. The notion is to avoid the all-too-common lid/container ...