Patent ID: 8215509

Claim:
A plastic bottle comprising: a mouth; a flexible main unit in fluid communication with said mouth, said main unit having a tubular body section; a base forming a bottom of said main unit and configured to support the bottle to stand upright, said mouth, said main unit, and said base defining a retention space with a central axis of the plastic bottle; and a rigid portion located above said main unit and having greater strength in a direction perpendicular to the central axis of the plastic bottle than said main unit, said rigid portion having regions facing each other across from the central axis at the most distant position from the central axis, wherein the tubular body section is configured to deform to a deformation state comprising a substantially flat shape without said rigid portion undergoing plastic deformation when an external force is applied in a direction perpendicular to the central axis of the plastic bottle; and wherein said rigid portion has a circumferential wall section outside of an upper wall of said main unit, and a connecting section above the upper wall, the connecting section connecting the circumferential wall section with the said mouth.