Material---The lunch box is made of food grade stainless steel and PP, safe and durable, no distortion and rustproof, silicone ring sealed in each layer, better to keep warm and cool. Waterproof - Each stainless steel inner layer is equipped with a soft silicone cover and buckle design. The double protection makes the bento box anti-scalding and leak-proof. You can bring soup or liquid food freely. Design --- The lunch box with 2 layers, keeping food separated and organized. Vent holes on the lid make it easy to open the lunch box when grabbing hot food. Portable handle for easy carrying. Portable --- This storage box with 2 layers, the lower level is a single compartment, the upper level is 2 compartments for more variety and more food. Application --- The lunch box is not only for the lunch box container, but also can be used as a cooler bag, ideal for use in the office, work, school, home. kindergarten, picnic and other outdoor activities.