https://www.easyjointgreen.com/collections/freezer-compost-container Compostable Freezer Containers Description Food Grade Biodegradable food-grade kraft paper which is no harm to health. This compostable freezer containers are mainly used to keep salad, fast food, soup, snack, rice, noodle, hot and cold food. These recyclable freezer containers for freezer can be heated in microwave oven and cold storage in refrigerator. Keep -20℃ to 120℃ temperature store.