A bottle assembly includes a container having a liquid chamber defined therein, and a vent assembly positionable substantially entirely within the liquid chamber of the container. A collar assembly generally defines a closure for the container and is releasably engageable with a neck of the container. The collar assembly and the container are configured relative to each other to enable selective configuration between a first configuration in which the vent assembly is disposed substantially entirely within the liquid chamber of the container and a second configuration in which the vent assembly is omitted from the container.本發明揭示一種瓶總成，其包含：一容器，其具有界定於其中之一液體腔室；及一通氣總成，其可實質上完全定位於該容器之該液體腔室內。一套環總成大致上界定該容器之一封蓋且與該容器之一頸部可釋放地嚙合。該套環總成及該容器係相對於彼此組態，以在其中該通氣總成實質上完全安置於該容器之該液體腔室內之一第一組態與其中從該容器省略該通氣總成之一第二組態之間實現選擇性組態。
