安装到瓶帽孔顶部的阀的特征在于：它具有小通风帽（3），该帽容 纳倒转的柔性容器（4）。
A valve attached to the top of the cap port is characterised in that it has a small ventilated cap (3) housing an upside-down flexible vessel (4).
这样在容物袋内可放置奶瓶、饮料瓶等，该结构简单，并且节省成本。
A feeder, a beverage bottle and the like can be placed in the bag for containing articles; the structure is simple; and the cost can be saved.
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