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 (151, 152) of the spring assembly, and wherein, in the pretensioned spring state, the two movable legs (151, 152) are arranged relative to each other in such a manner that a torsion spring arranged between the two legs (151, 152) is in a pretensioned state, and wherein, during the transition from the pretensioned spring state into the relaxed spring state, the legs (151, 152) 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 (151, 152) of the spring assembly, and wherein, in the pretensioned spring state, the two movable legs (151, 152) are arranged relative to each other in such a manner that a torsion spring arranged between the two legs (151, 152) is in a pretensioned state, and wherein, during the transition from the pretensioned spring state into the relaxed spring state, the legs (151, 152) move relative to each other in such a manner that the torsion spring passes into a relaxed state.