Proposed is a cartridge system for making a beverage, the cartridge system being insertable into a beverage preparation machine and comprising: a cartridge that includes a reservoir filled with a beverage substance; and a cartridge receptacle that is connected to the cartridge; the cartridge receptacle includes a mixing chamber fluidically connectable to the reservoir, and a fluid feed line extending into the mixing chamber; the cartridge has a cartridge wall; characterized in that the cartridge wall includes a flange for attaching a sealing element.