High-quality materialThe inner layer is made of high-quality stainless steel, mirror-polished and easy to clean. The outer layer is made of food-grade PP material, which is high-temperature resistant, safe and hygienic. The lock is made of PP plastic and can be fixed with a key to prevent leakage.Good airtightnessThe breathable sealing valve on the lunch box can remove air, making the food inside the box more airtight and easy to open the lid. The built-in sealing rubber ring improves the sealing performance of the lunch box and keeps it warm for a long time. (Keep warm time: this product is a regular lunch box, not a vacuum insulated lunch box. The insulation time is related to the food temperature and the ambient temperature.)Hidden handle designThe handle of the portable lunch box can be folded and hidden, it does not take up space and is easy to carry. Thanks to the separate containers, you don't have to worry about mixing food or getting moldy. You can transport many different types of food at the same time.Easy to useThe bento box can not only be used as a lunch box container, but also as a freezer bag, which is convenient for you to store meals, snacks, fruits and desserts and then put them in a bowl or carry them around with the handle.Wide applicationThe lunch box is compact and portable, suitable for home, work, travel and school. A must-have for work lunches, picnics, travel, camping or other outdoor activities, a better solution for your delicious lunch.