Storage container and method for injecting liquid thereinto

A storage container comprising:

• a tube made of an expandable or contractible elastic material;
• a valve configured to be coupled to an upper end of the tube before a liquid is injected into the tube;
• a support ring configured to accommodate the tube and the valve, the support ring comprising a ring body configured to accommodate and protect the tube, and a coupling plate disposed on an outer surface of the ring body;
• and
• a casing configured to be separably coupled to the coupling plate of the support ring and to accommodate and protect at least part of an assembly comprised of the tube, the valve, and the support ring,
• wherein the valve comprises:
• a ring-shaped support portion configured to be seated and supported at the upper end of the tube;
• and
• an elastic membrane extending from an end of the ring-shaped support portion and configured to close an opening portion of the tube, and
• wherein the coupling plate of the support ring comprises:
• a first coupling plate disposed outside the casing and supported on an outer surface of the casing when the coupling plate is coupled to the casing;
• and
• a second coupling plate that is spaced apart from the first coupling plate in an axial direction of the ring body, the second coupling plate being disposed inside the casing and supported on an inner surface of the casing when the coupling plate is coupled to the casing.