Abstract: There is provided a container assembly which includes a container body with an internal space that accommodates contents, which are fluids, and featuring a nozzle assembly at the top that ejects the contents; a transfer tube connected to the nozzle assembly and thus into the internal space while forming a fluid path on which the contents are transferred through the nozzle assembly; and a quality maintenance unit coupled to at least more than one transfer tube which mixes the contents in the internal space and maintains the state and quality of the contents to be ejected through the nozzle assembly, and which helps maintain the quality of the contents in the container body to ensure the contents can be ejected properly.