Abstract: A closure assembly for a container including an internal cap and an external cap which are handled as one cluster is disclosed. The internal cap is tightly fitted into an outlet opening of a container and having a flange formed on an insertion portion, and the external cap has a threaded portion engaged to an outer periphery of the outlet opening to enclose the internal cap, in which the internal cap and the external cap have a corresponding locking member to prevent the internal cap from being disengaged from the external cap.

Abstract: Disclosed is a closure assembly for a container including an external cap and an internal cap coupled to the external cap to securely seal the container and be convenient for use. The closure assembly includes a container stored with contents and having an outlet opening formed on an upper portion thereof, an internal cap tightly fitted into the outlet opening, an external cap engaged to an outside of the outlet opening, and a resilient coupling member integrally formed on an upper portion of the internal cap and fixed to a bottom of the external cap.