Silicon Food Packaging​ It's better than plastics.
https://www.forbes.com/sites/kateharrison/2015/06/18/1874/#2b70dd2c71f4
https://lifewithoutplastic.com/silicone/
2010: https://www.scientificamerican.com/article/earth-talk-silicone-tally/
Manufacturer's notes: https://www.prepol.com/news/food-pharma-news/is-silicone-food-safe
Wiki: https://en.wikipedia.org/wiki/Silicone