PURPOSE: To prevent vaporization of gas melting in liquid during storage after unsealing, by providing an opening which a sealing lid is attached to and detached from and also a bellow part which can extend and shrink so as to adjust containing volume.

CONSTITUTION: A body part 1 is formed in a cylinder with a bottom part and also provided with a bellow part B on its external peripheral surface. A mouth part 3 is also formed in a cylinder having an opening 3d and also provided with a screw part 32 with which a lid engages on its external peripheral surface 31. By extending and shrinking the bellow part B, a containing volume of a bottle A can be adjusted according to a volume of liquid contained in the bottle A, so that a gap volume inside the bottle A can also be adjusted. By this, even when drinks such as carbon oxide soft drinks remain undrunk in the bottle A, as the gap volume can be decreased to its minimum by decreasing the inside volume of the bottle A according to the remaining amount of the liquid, gas component in the remaining liquid can be prevented from vaporizing, so that flavor and taste of the drinks can be retained.