Closure

A closure for a container, comprising:

• a. a ring-shaped base element extending around a longitudinal axis and having a first through opening,
• b. a ring-shaped rotary element with a second through opening, the ring-shaped rotary element being operatively connected to the base element and rotatable relative to the base element about the longitudinal axis, wherein the rotary element comprises a first guide means and/or the base element comprises a second guide means for guiding the rotary element in the direction of the longitudinal axis, wherein the first and/or the second guide means are interrupted over the circumference by at least one ventilation channel, and
• c. at least one closing element having a first end and a second end, wherein
• i. the at least one closing element is operatively connected at the first end to the base element and at the second end to the rotary element, and wherein
• ii. a closure opening defined by the at least one closing element is radially constrictable by a displacement of the second end in relation to the first end, and wherein
• iii. a movable region of the at least one closing element defined by the first end and the second end of the at least one closing element, is arranged inside the first and/or the second through opening.