Dopje

Dopje is a Dutch noun formed as a diminutive of dop, meaning a small cap, lid, or stopper that closes or protects an opening. The diminutive form signals a smaller version of a cap or stopper and is commonly used for very small closures on containers.

Common uses and contexts include bottle tops, jars, medicine vials, toothpaste tubes, spray devices, and other packaging where a cap or plug serves as a seal or protective cover. A dopje can be made of plastic, metal, rubber, cork, or composite materials, depending on the container and its contents. In manufacturing and packaging, dopjes are designed to fit specific openings and to be removable for access to the contents.

In everyday language, dopje can refer to any small closure or protective cap, even if not strictly a bottle cap. The term is more about size and function than a particular design, so different industries use their own terminology for the exact shape or fit.

Related concepts include bottle cap, stopper, cork, lid, and plug. While dopje is widely used in Dutch, other languages have their own terms for similar small closures.