Very good point! I am thinking about some kind of a gas mask, but for another reason. I travel to some countries, where toilets stink so much, that I try to avoid them. But in some occasions it is impossible. Any light fibre masks and handkerchiefs did not help because they are good for dust, but not for smell. I have been once in a toilet where some smart person put a Soviet gasmask!!! It worked perfect, but too bulky to carry. It may sound funny, but for me it is a big issue! Does anybody know some masks or respirators that are relatively compact, cheap and reusable, which I could use for this purpose? I do not need goggles.