A removable lid for a container of a vessel, comprising: a) a valve configured to selectively allow air to vent out of a fluid retaining interior region of the container when the lid is positioned on the container, the valve comprising an opening that extends entirely through a thickness of a portion of the lid, the valve further comprising a valve plug that comprises: i) a valve top portion that extends vertically above a top surface of the portion of the lid, wherein the valve top portion is configured to be contracted, by a downward pressure, into a more vertically compact shape, wherein the valve top portion is further configured to, absent the downward pressure, expand back upwards out of the more vertically compact shape, wherein the valve top portion includes a top level configured to move downwards towards a top surface of the portion of the lid when the valve top portion is contracted into the more vertically compact shape, wherein the valve top portion further includes a bottom level configured to remain substantially in the same position when the valve top portion is contracted into the more vertically compact shape; ii) a valve bottom portion that extends vertically below a bottom surface of the portion of the lid; and iii) a valve central portion positioned at least partially within the opening of the portion of the lid, the valve central portion coupling the valve top portion to the valve bottom portion, characterized in that the valve central portion comprises a wide region configured to at least substantially seal the opening, wherein the valve central portion further comprises a narrow region configured to unseal the opening so as to provide an air passageway through the opening. a) a valve configured to selectively allow air to vent out of a fluid retaining interior region of the container when the lid is positioned on the container, the valve comprising an opening that extends entirely through a thickness of a portion of the lid, the valve further comprising a valve plug that comprises: i) a valve top portion that extends vertically above a top surface of the portion of the lid, wherein the valve top portion is configured to be contracted, by a downward pressure, into a more vertically compact shape, wherein the valve top portion is further configured to, absent the downward pressure, expand back upwards out of the more vertically compact shape, wherein the valve top portion includes a top level configured to move downwards towards a top surface of the portion of the lid when the valve top portion is contracted into the more vertically compact shape, wherein the valve top portion further includes a bottom level configured to remain substantially in the same position when the valve top portion is contracted into the more vertically compact shape; ii) a valve bottom portion that extends vertically below a bottom surface of the portion of the lid; and iii) a valve central portion positioned at least partially within the opening of the portion of the lid, the valve central portion coupling the valve top portion to the valve bottom portion, characterized in that the valve central portion comprises a wide region configured to at least substantially seal the opening, wherein the valve central portion further comprises a narrow region configured to unseal the opening so as to provide an air passageway through the opening. i) a valve top portion that extends vertically above a top surface of the portion of the lid, wherein the valve top portion is configured to be contracted, by a downward pressure, into a more vertically compact shape, wherein the valve top portion is further configured to, absent the downward pressure, expand back upwards out of the more vertically compact shape, wherein the valve top portion includes a top level configured to move downwards towards a top surface of the portion of the lid when the valve top portion is contracted into the more vertically compact shape, wherein the valve top portion further includes a bottom level configured to remain substantially in the same position when the valve top portion is contracted into the more vertically compact shape; ii) a valve bottom portion that extends vertically below a bottom surface of the portion of the lid; and iii) a valve central portion positioned at least partially within the opening of the portion of the lid, the valve central portion coupling the valve top portion to the valve bottom portion, characterized in that the valve central portion comprises a wide region configured to at least substantially seal the opening, wherein the valve central portion further comprises a narrow region configured to unseal the opening so as to provide an air passageway through the opening.