【High-Quality Material】The inner layer of the insulated lunch box is made of high-quality stainless steel, mirror-polished and easy to clean. The outer layer is made of food-grade PP material, high-temperature resistant, safe, and hygienic. The latch is made of PP plastic and can be secured with a key to prevent leakage. 【Good Airtightness】The lunch box's breathable sealing valve 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 lunch box's sealing effect and keeps it warm for a long time. (Heat retention time: this product is a regular lunch box, not a vacuum-insulated lunch box. The insulation time is related to the food's temperature and the ambient temperature.) 【Hidden Handle Design】The handle of the portable lunch box can be folded and hidden, it doesn't take up space and is easy to carry. Thanks to the separate containers, you don't have to worry about mixing food or getting mold. You can transport many different types of food at the same time. 【Easy to Use】The bento box can not only be used as a lunch box but also as a freezer bag, which is convenient for storing meals, snacks, fruits, and desserts and then placing them in a bowl or carrying them around in the handle. 【Wide Range of Applications】The lunch box is compact and portable, suitable for home use, work, travel, and school use. A must-have for work lunches, picnics, travel, camping, or other outdoor activities, a better solution for your delicious lunch.