the invention relates to a mixing device for mixing a pulverulent product , which is contained in a film sachet that is soluble in liquid , with said liquid and optionally at least one additional component . the aim of the invention is to accelerate the mixing of pulverulent products , which are packed in film sachets that are soluble in liquid , with a liquid , without the risk of creating dust . this is achieved by a sealable mixing container comprising a receiving chamber for the pulverulent product contained in the film sachet , the liquid and the optional additional component . the receiving chamber is equipped with fitted components , which act mechanically on the film sachet .