Abstract: A new flask for two products, includes a general flask body having a neck; a vessel housed inside the neck of the general flask body and having a weakened part; the neck of the flask body including a thread, and a flange at an upper part of the neck; a cap which screws onto an outside of the neck, the cap including a thread which is complementary to the thread on the neck, a flange which is complementary to the flange on the neck, a wall defining a hole, and a vertical projection which emerges from an inside of the cap, in the form of a short cylinder with extremely sharp edges, the length of the cylindrical vertical projection from the inside of the cap being such that the vertical projection facilitates cutting of the weakened part of the vessel, when the cap is screwed down; and a cover hinged to the cap and made from the same material as the cap, for fully sealing a top of the cap by pressure, the hinged cover of the cap having a central projection at a lower part thereof corresponding to the hole and of