System for delivering breathing gas to occupant

A system (10) for delivering breathing gas to a passenger, the system comprising:-a mask (30) comprising a face portion (20) having a breathing lumen (34); -a tube (4B) configured to be supplied with a pressurized breathing gas; and-a gas pocket (40) disposed between the tube (4B) and the facial portion (20), a passage (35) connecting the gas pocket (40) to the breathing chamber (34) such that the system is configured to supply the breathing chamber (34) via the gas pocket (40), the gas pocket (40) comprising a front portion (40a) connected to the mask (30) and a rear portion (40b) connected to the front portion (40a), the front portion (40b) being connected to the rear portion (40b). The system has a stowed configuration in which the gas pocket (40) remains folded between the backing (50) and the face portion (20), and an expanded configuration in which the gas pocket (40) remains folded between the backing (50) and the face portion (20). 一种用于向乘客递送呼吸气体的系统(10)，所述系统包括：-面罩(30)，所述面罩(30)包括具有呼吸腔(34)的面部部分(20)；-管件(4