Material: Stainless Steel The lunch box is made of food-grade 304 stainless steel, which is molded from a single piece and does not rust easily. Compared with plastic lunch boxes, it contains no plastic, BPA, chemicals, or toxins and is more durable. You don't have to worry about product quality and food safety. AIRTIGHT & WATERPROOF The stainless steel lunch box has a built-in silicone sealing ring to prevent water or oil from leaking inside, and the buckle design prevents swinging and slipping. Whether at school, in the office, or outdoors, you don't have to worry about food spilling. Partition Design The stainless steel lunch box has 2 built-in removable dividers. Using 2 dividers, it creates 3 compartments, divides different types of food into separate compartments, and stores snacks safely and without any peculiar smell. The lunch box with compartments is perfect for any adult, kindergarten or school-age child, making it the ideal lunch box for all ages. QUICK CLEANING: The