The utility model provides a gasbag, including airbag body, first joint and second connect, airbag body is the inwards sunken formation of one corner of a square casing, first joint and second connect set up in sunken one side of airbag body, airbag body is silicon rubber materials, first joint passes through tube coupling in external vacuum pump export, the second connects through tube coupling in external oxygen -increasing machine export, and above -mentioned simple structure is fit for the industrial production, additionally, the volume of gasbag breathes required breathing volume according to the human body at every turn and the oxygen -increasing machine goes on designing, have store up the existing gas body, shock attenuation, fall make an uproar, the steady special effect of air current.