B737-700
Physiological - Other
Aircraft Equipment Problem Critical
General None Reported / Taken
Aircraft; Human Factors
I flew a B737-700 this week and another not too long ago with full face mask oxygen masks.  Both times I put them on while the First Officer went to the lavatory it was obvious that they would NEVER fit my face.  They are entirely too large.  There is no way to achieve a seal not even with positive pressure.  I don't know if they are made like this or getting stretched out when guys use them; but it is obvious that in a fire I would be dead.  I am not particularly small; although I am a trim female.  These are obviously made only for big boys making it appear the rest of us are expendable.
B737 Captain reports that the full face oxygen mask found on some B737-700 aircraft will not fit her face and does form as seal around the edges (too large).