Oxygen self rescue device , having - a gas cartridge , - a mouthpiece , - a tube connecting the gas cartridge and the mouthpiece , - a breathing bag which is hydrodynamically connected to the gas cartridge and to the tube , and - a spring assembly within the breathing bag , wherein the spring assembly comprises at least one spring which is fastened to the breathing bag and/or to the gas cartridge , and wherein, in an unused, packed-together state of the oxygen self rescue device , the spring assembly is in a pretensioned spring state, and wherein, in the event of an externally triggered transition from the unused, packed-together state of the oxygen self rescue device into a used, extended state of the oxygen self rescue device , the spring assembly leaves the pretensioned spring state in such a manner that the spring assembly sets the breathing bag upright and, in the process, generates a negative pressure within the breathing bag such that the negative pressure conducts breathable gas into the breathing bag and thereby prepares the latter for ventilation of a user of the oxygen self rescue device , and wherein the spring assembly has at least two mutually movable legs of the spring assembly , and wherein, in the pretensioned spring state, the two movable legs are arranged relative to each other in such a manner that a torsion spring arranged between the two legs is in a pretensioned state, and wherein, during the transition from the pretensioned spring state into the relaxed spring state, the legs move relative to each other in such a manner that the torsion spring passes into a relaxed state. - a gas cartridge , - a mouthpiece , - a tube connecting the gas cartridge and the mouthpiece , - a breathing bag which is hydrodynamically connected to the gas cartridge and to the tube , and - a spring assembly within the breathing bag , wherein the spring assembly comprises at least one spring which is fastened to the breathing bag and/or to the gas cartridge , and wherein, in an unused, packed-together state of the oxygen self rescue device , the spring assembly is in a pretensioned spring state, and wherein, in the event of an externally triggered transition from the unused, packed-together state of the oxygen self rescue device into a used, extended state of the oxygen self rescue device , the spring assembly leaves the pretensioned spring state in such a manner that the spring assembly sets the breathing bag upright and, in the process, generates a negative pressure within the breathing bag such that the negative pressure conducts breathable gas into the breathing bag and thereby prepares the latter for ventilation of a user of the oxygen self rescue device , and wherein the spring assembly has at least two mutually movable legs of the spring assembly , and wherein, in the pretensioned spring state, the two movable legs are arranged relative to each other in such a manner that a torsion spring arranged between the two legs is in a pretensioned state, and wherein, during the transition from the pretensioned spring state into the relaxed spring state, the legs move relative to each other in such a manner that the torsion spring passes into a relaxed state. <EOS>