Abstract: A beverage container is configured to prevent a beverage from leaking out even when a user tilts the container, and to allow the user to easily drink the beverage even when pressure within the container is negative. The beverage container can include a container main body, a base member, and a cap body. The base member can have a vent for regulating a pressure variation in the container main body, and a ventilation valve for introducing air from the outside when the pressure within the container main body becomes negative in relation to the outside pressure and capable of preventing leakage of a liquid beverage contained in the container main body. The cap body can include a ventilation open/close hood capable of changing the state of the vent to a ventilation state or a closed state.

Abstract: A breast pump can include a breast pump main body having a milking portion and negative pressure generating structure for generating negative pressure. The milking portion can include a shape maintaining portion and a negative pressure generating portion that serves as a part of the negative pressure generating structure and can be attached to and detached from an inner side of the shape maintaining portion. At least one end of the negative pressure generating portion on an enlarged diameter side can include a flexible diaphragm portion and a pressing portion formed when a folded-back portion of the diaphragm portion passes an imaginary line of extension of a contact portion contacting the breast to press the breast, while the other end of the negative pressure generating portion is connected to the opening/closing structure.

Abstract: The disclosed subject matter provides a beverage container configured to prevent a beverage from leaking out even when a user tilts the container, and allows the user to easily drink the beverage even when pressure within the container is negative. The beverage container can include a container main body, a base member, and a cap body. The base member can have first ventilation means for regulating a pressure variation in the container main body, and second ventilation means for introducing air from the outside when the pressure within the container main body becomes negative in relation to the outside pressure and capable of preventing leakage of a liquid beverage contained in the container main body. The cap body can include ventilation open/close means and the like capable of changing the state of the first ventilation means to a ventilation state or a closed state.

Abstract: A breast pump can include a breast pump main body having a milking portion and negative pressure generating structure for generating negative pressure. A storing structure can be provided for storing expressed milk, and an opening/closing structure can be disposed between the breast pump main body and the storing structure for temporarily halting or permitting passage of the expressed milk into the storing structure. The milking portion can include a shape maintaining portion and a negative pressure generating portion that serves as a part of the negative pressure generating structure and can be attached to and detached from an inner side of the shape maintaining portion.