BioGreenChoice Brand Product BGC-101 – 6x6x3″ Compostable Fiber/Bagasse Take out Container (Burger Box) – Case of 500 – 100% biodegradable and compostable. Made from 100% plant fiber. They are made from bagasse which is plant material after extraction of juice from sugarcane. Microwave and freezer safe. Good for both hot and cold items. Handle hot liquid up to 220 Fahreinheit. Soak proof. Have no plastic or wax lining. Very strong and sturdy compare to styrofoam products. Composts in 1-3 months in a commercial composting system. Meet FDA requirement for food contact. Meet ASTM requirements for compostability. BPI ( Biodegradable Products Institute) certified.