Leak-proof design: The secure closure is made of PP plastic and can be easily pressed together to seal, preventing leaks and allowing you to enjoy your lunch with peace of mind. Note: The insulation layer prevents burns and keeps food warm for about 2 hours. Our product is a regular lunch box, not a vacuum insulated lunch box. The insulation time depends on the food temperature and ambient temperature. We apologize for any inconvenience this may cause. Sealed box: The breathable sealing valve releases air, ensuring better sealing of the food inside and making it easy to open the lid. Cute and practical: The hidden double-arc handle is compact and portable, suitable for home, work, travel, and school. Hygienic and healthy: The inner layer is made of high-quality stainless steel, highly polished and easy to clean; the outer layer is made of food-grade PP material, which is heat-resistant, safe, and hygienic.