Abstract: An apparatus may include an insert configured to be positioned between a nipple and an opening of a bottle when the nipple is mounted to the bottle. The insert is configured to facilitate airflow out of the bottle and through an interface between the nipple and the bottle when the nipple is dispensing fluid from within the bottle. A system may include a nipple, the insert, and a bottle with an opening. A method may include providing the insert, and positioning the insert between a nipple and an opening of a bottle when the nipple is mounted to the bottle.

Abstract: The invention is directed to a push-pull closure for a drink container including a mouthpiece holder. The container includes a pin, which projects into the through-opening of the mouthpiece holder; several bars, parallel to the pin and arranged around the pin, which are connected to the mouthpiece holder and to the pin; a mouthpiece that is axially displaceable and sealing with respect to the mouthpiece on the outer circumference and accommodating the pin in the further through-opening; at least one circumferential seal element, which blocks and unblocks the passage of liquid through the further through-opening in an closing/opening position of the mouthpiece in the mouthpiece holder; and several ribs of a soft elastic material, axially extending on the circumference of the mouthpiece at the bottom, wherein the mouthpiece may be inserted into the mouthpiece holder, and the bars can engage free spaces and the ribs engage recesses between the bars.

Abstract: Closure system for a children's drinking bottle or a children's drinking cup comprising a sealing ring which has on an external periphery a fastening means for sealingly and releasably connecting to a container edge of a container of the children's drinking bottle or the children's drinking cup, an aperture for receiving a mouthpiece and/or a blind lid and an internal thread, which borders the aperture and is arranged at a distance from the aperture and the fastening means and a fixing insert with a through aperture and an external thread which may be screwed into the internal thread of the sealing ring in order to clamp sealingly a fastening attachment of the mouthpiece and/or the blind lid between the fixing insert and the sealing ring.