Be careful out there, my GF sisters and brothersd
Spouse just bought a bento box yesterday to bring our "airport" snacks on our flights. I asked him if it was dishwasher save and he looked at the label and said "I don't think so, it's made out of wheat fiber."
We both did a sitcom-worthy double take.
I've been GF for over 15 years and it never occurred to me to be cautious about "plastic" containers. If I hadn't asked, the label on the box would have hit the trash and I never would have known. One of my biggest fears is getting sick on a flight with the seat belt sign illuminated. This is the exact reason we bring our own snacks on long flights.
Be careful out there.