Container for holding a fluid and an assembly of a container and an outlet

A container for holding a fluid comprising:

• a fluid chamber having an inner wall and an outlet-opening;
• and
• a high pressure chamber for driving the fluid towards the outlet-opening;
• wherein the container further comprises as at least part of a divider between the high pressure chamber and the fluid chamber a moveable element for advancing in a predetermined direction of motion through the container from a first position to a second position for reducing a volume of the fluid chamber when fluid is dispensed via the outlet-opening, wherein a first and a second cross section of the fluid chamber taken transverse to a direction of motion at respectively the first and second position have different dimensions, wherein at one of the second positions, the transverse cross section of the container is larger than at one of the first positions, wherein the moveable element is a resilient element which is biased towards expanding in directions transverse relative to the predetermined direction so that tight contact between the element and the inner wall of the container is maintained during movement of the moveable element from the first to the second position.