I wondered about these. I have tortilla warmers that have some sort of plastic in them. I wanted to make some, but wasn't sure what they used. I hand washed them and the fabrics bled all over the place. I wonder if you really need the plastic wrap inside (there was batting in it too). I might try this batting for the tortilla warmers. I did read that everything in it needs to be 100% cotton. But I'm sure there's plastic sheeting of some sort in my tortilla warmer that I purchased at the Del Mar Fair.