Closure

A closure, for sealing of a neck finish of a liquid container, comprising

• a top deck and an outer skirt extending from the top deck in an axial direction (z) away from the top deck, said outer skirt comprising at least one locking means for engaging with the neck finish of the liquid container;
• a circumferential deformable primary sealing lip depending from an inner surface of the top deck and spaced radially inwardly from the outer skirt, said
• primary sealing lip comprising a dorsal end connected to the inner surface of the top deck and a free distal end arranged opposite to the dorsal end, the primary sealing lip being inclined radially towards a center of the closure;
• and
• a circumferential first support element and a circumferential second support element, wherein both the first support element and the second support element have semi-circular cross-sections and are positioned on the inner surface of the top deck;
• wherein the first support element is spaced radially inwardly of the primary sealing lip and the second support element is spaced radially inwardly of the first support element;
• wherein the second support element has a larger height in the axial direction than the first support element;
• wherein when the closure is applied to the neck finish of the container, the primary sealing lip comes into contact with a rim of the neck finish of the liquid container and thereby forms:
• a first chamber, defined by the primary sealing lip, the first support element, and the inner surface of the top deck, and
• a second chamber defined by the primary sealing lip, the first support element, the second support element, and the inner surface of the top deck.