BPA-free, the container is made of 100% food-grade PP and silicone: non-toxic, environmentally friendly, avoiding greasy and super smooth surfaces from the inside, and very easy to clean. Each container can be folded to 1/3 of its original size to achieve compact storage and organization, save a lot of space and better store food. It can be used at a temperature of -40C ~ 120C, and the heating time does not exceed 5 minutes. The microwave and refrigerator are safe. Note: The oven is not available. The valve structure is designed to allow hot gas to escape without the formation of water vapor. Therefore, it is not suitable for liquids that can escape from the valve, such as water and soup. Easy to assemble and carry, suitable for indoor food storage, work, camping, hiking, traveling and other outdoor activities, folding when not in use, easy to store, small space. Product Why choose silicone collapsible food container Silicone material can preserve the deliciousness of food. And provide more protection than plastic materials. The soft and fine silicone material is exquisite and durable, and the grease is simple and easy to clean. The seal does not contain slightly toxic ingredients, is durable and safe to use. Excellent material, heat and cold resistance, suitable for microwave heating and refrigeration. The lightweight design is very suitable for your travel, such as school, work, travel, etc. Technical data: Material: Food Grade Silicone Color: blue Size: 350ml, 500ml, 800ml. Package includes: 3 x silicone foldable food container