The word 容器 is formed by combining two meaningful characters into a single conceptual unit: 容, which conveys the idea of "holding" or "containing", and 器, which means "vessel" or "implement". Together, they create a compound where the first character describes the primary function and the second specifies the category of object, resulting in the direct, logical concept of a "container" or "receptacle", an object (器) whose purpose is to contain (容).