High Quality MaterialsThe inner layer of the insulated lunch box is made of high quality stainless steel, mirror polished, easy to clean. The outer layer is made of food grade PP material, high temperature resistant, safe and hygienic. The lock is made of PP plastic, only one key is needed to fix it and prevent leakage. Heat preservation time limit in 1- 2 hours Good Airtightness The breathable sealing valve of 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 an ordinary lunch box, not a vacuum insulated lunch box. The insulation time is related to the temperature of the food 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 light to carry. Thanks to the separate containers, you don't have to worry about mixing food or getting mouldy. 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 by the handle. Wide ApplicationThe lunch box is compact and portable, suitable for home, 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.