Container of a bag-in-container type, wherein a neck region of the container is provided with at least one opening extending substantially radially there through, into a space between the outer container and an inner container adjacent thereto, wherein: the neck region is provided with coupling elements, preferably at opposite sides of said at least one opening, seen in circumferential direction, for coupling of a connecting device to the container for introducing a pressure fluid through said at least one opening into a space between the inner and outer container; and/or the at least one opening is provided with or forming part of a first coupler for coupling a pressure fluid feed line to said opening, for pressurising a space between the inner and outer container.