Some oven bags contain Teflon. I didn't know before I read this thread and the bad news about those poor birds.
I wish there was a way to know if they contain Teflon or not?
https://www.alibaba.com/showroom/teflon-oven-bag.htmlThis is in China, but I think there are companies that might buy their bags from there because they are cheap?
I have never used these transparent bags in the oven, but occasionally I buy frozen products that are in containers that are to be put in the oven, but I never had problems with my baby.