Keep Food Fresh: Great Meal Prep Lunch Box to keep your food fresh and meal preps easy. Safety: The container and the lid are made by BPA-Free and Food-Grade Safe PP material. Reusable and Durable: The container is designed to stackable in the freezer or lunch bag, with leaking-proof and air tight lid. Microwave / Freezer / Dishwasher Safe On Top Rack: Withstand temperature from -40°F to 320°F (Or -40°C to 160 °C) USPTO Patent No: US 2018/0086500 A1