I use depends adult diapers as a mask..unused ones from when I had a colonoscopy and wanted to protect the car seats driving in...just in case. Most will find that the crotch is a little wide, so use a twister from a loaf of bread by your nose.
I’ve got some Tena pads left over for when Petunia was in heat and I was trying to use them as pads for her.
I might have to look into this.