Superior Temperature Insulation – The vacuum insulation and insulated bag provide up to 6 full hours of warm retention; nearly twice as long as others. NO more cold lunch. NO more microwave. The vacuum insulation provides right temperature to keep food stay warm and healthy. Convenient for you to enjoy tasty homemade food at school or workPremium Material – Interior and exterior are made from high quality food-grade stainless steel SS304 which will never rust and is naturally BPA-free. Does not retain flavors or scents, so you can use it over & over again. The handle and divider are made from food grade plastic. Please be aware that it CAN'T be used in the microwave or dishwasher.Leak & Spill Proof - Between each stackable insulated compartment are heavy-duty silicone seals to lock in freshness, leaks and odors. Please be aware that the coupling between layers is tight to prevent leak and spill. After using it for a couple of times, it will become smooth.Lunch Bag Included - Made of felt fabric and food-grade aluminum foil lined interior, it can not only enhance the insulation, but also make it easier to be carried around.Ideal for Portion Control – Wrap it with ribbons, give it to someone you love so they can enjoy home made delicacy for a healthier eating style!