Abstract: An assembly for preparing a beverage comprises a concentrate containing package and an apparatus for receiving the package and for preparing a beverage with the concentrate. The apparatus comprises a recess for receiving said package, a concentrate discharge channel debouching in said recess and connecting to a mixing chamber, and movable pressure element for pressurizing the package. The package rupturing mechanism is positioned in said concentrate discharge channel in a manner as not to protrude effectively into the recess. The package is sufficiently flexible as to bulge out locally towards the concentrate discharge channel and into contact with the package rupturing mechanism when pressurized by the pressure element. Further a package and an apparatus for use in the assembly are provided.