Container and a closure for a container

A container and a closure for the container, the container having a side surface and a rim that defines an opening and an opening axis that is perpendicular to the opening;

• wherein the closure is configured to close the opening;
• the container and closure have respective thread portions that cooperate to define movement of the closure relative to the container in a direction parallel to the opening axis as the closure rotates about the opening axis relative to the container;
• the closure has a seal, configured to be able to form a fluid-tight seal against the side surface of the container;
• and
• the thread portions of the container and the closure are configured such that, as the closure rotates relative to the container, the seal is moved in the direction parallel to the opening axis to contact three regions on the side surface of the container, the three regions comprising:
• a first region on the side surface of the container, configured such that, as the seal is moved across the first region, the seal changes between an uncompressed state and a compressed state between the container and closure;
• a second region on the side surface of the container over which the seal remains compressed and comprising at least one groove or ridge configured to prevent the seal from forming a fluid-tight seal against the side surface of the container in the second region;
• and
• a third region on the side surface of the container on which the seal forms a fluid-tight seal between the side surface of the container and the closure,
• wherein the at least one groove or ridge of the second region extends from at least the first region to at least the third region,
• wherein the thread portions of the container are positioned on the side surface of the container at a location that is further from the rim than the first, second and third regions on the side surface of the container.