Health and safety: The lunch box is made of high-quality food-grade silicone, non-toxic, SGS, LFGB certified, safer than general plastic materials. Suitable for microwave and refrigerator, no harm to your health. Suitable for Many Occasions: The silicone collapsible lunch box is perfect for indoor food storage, such as home, bar, restaurant and outdoor activities, such as office, school, picnic, company, camping, hiking, traveling, etc. Microwave, oven, freezer, and dishwasher safe. Portable folding lunch box, light in weight, can be carried anywhere. Different Sizes: 2 sizes to meet your different needs. Small size 350ml (nuts and sweets for children), large size 550ml (fruit, cake, soup). Valve design: heat can be discharged, no water vapor will form inside the lunch box. So it is not suitable for liquids that may leak from the valve, such as water and soup. When using the microwave oven, the vent valve needs to be pulled up. Save Space: The foldable design can save you more than 60% space. No More Messy Tupperware Cabinets The silicone storage container is convenient for you to store, saving you a lot of space. Microwave, freezer and dishwasher safe. When not in use, it can be folded to a thickness of 3cm to save storage space, and it can also be used as a plate to change its shape. You will receive 2 different sizes to meet your different needs.