★ HIGH QUALITY: lunch box is made of stainless steel and food grade PP material, BPA-free, healthy and durable. We use thicker materials that are not easy to break. The top and bottom are very strong. ★ LEAK-PROOF: The lid fits tightly to the stainless steel food tray, so food does not run from one compartment to another, preventing food from mixing. With a 100% leak-proof bowl, you can store liquids such as sauces or yogurt in it. ★ DISHWASHER/ FREEZER SAFE: This Stainless Steel tray is removable, can be cleaned up easily in the dishwasher. The plastic bottom box is freezer safe, BPA free, another useful function is you can pour in some hot water before you eat to heat the food ★ PORTION CONTROL: 4 compartments Features, convenient to store variety food with divided lunch box design, portioned perfectly for adult/ child’s appetite, durable and easy to-go. ★ ALL FOOD IN ONE CONTAINER: 4 compartments can fully accommodate the nutritional needs for children’s school lunch, you can put cut-up sandwiches, soup, pasta, noodle, green salad, wraps, chips, nuts, dried fruit, and fruit and so on. ★ Thermal Technology – The built-in water injection feature makes it easy to heat or cool. Simply add hot or cold water into the bottom basin before breakfast, lunch, or dinner. The bottom bowl is made of food grade PP and can also be used to hold fruits or salads. The lunch box itself does not have a long-term heat preservation effect, it needs to be added with hot water to achieve heat preservation, and the heat preservation time is about 1 hour.