Safe MaterialsThis stackable bento box is made of food grade safe PP (outer layer) and durable 304 stainless steel (inner layer), BPA free, you can eat it with confidence. Super Thermal InsulationVacuum Insulation and Insulation Bags provide up to 3-4 hours of heat preservation time; almost double the heat preservation time of other lunch boxes. Simple to CarryThe insulated lunch bag is made of a stylish Oxford cloth outer layer and a food-grade aluminum foil inner layer, which not only improves the heat preservation time of the lunch box but also is easy to carry. Leak ProofThere are heavy duty silicone seals between each stackable insulating compartment to lock in freshness, leaks and odors. Note that each layer is tight to prevent leaks and spills. It gets smooth after a few uses. Wide ApplicabletHE thermal lunch box is perfect for storing soup, fried rice, pasta or other hot food; can also be used for storing cold food such as salad, fruit, etc. Description: The Interior is made from high-quality food-grade stainless steel which will never rust and is naturally BPA free. Does not retain flavors or scents, so you can use it over & over again. The exterior and dividers are made from food-grade safe pp. It can be used for hot food such as soup, fried rice, etc which will keep warm for 2-3 hours or cold food, such as salad, pasta, fruit, etc. 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 leaks and spills. After using it a couple of times, it will become smooth. Features: Snack compartment: 11.5*6.5cm Large food grid: 11.5*9cm Two-layer insulation bag: 13.5*18cm Three-layer insulation bag: 13.5*24cm Two-layer insulation bag: 15*24cm Two floors List: 1*Snack tray 1*Large Food Grid 1*Insulation bag 1*Chopsticks 1*spoon 1*spoon box Three layers List: 2*Snack tray 1*Large Food Grid 1*Insulation bag 1*Chopsticks 1*spoon 1*spoon box Four floors List: 2*Snack tray 2*Large Food Grid 1*Insulation bag 1*Chopsticks 1*spoon 1*spoon box