304 liner: the liner is made of high-quality 304 stainless steel, highly mirror polished, easy to clean. Silicone sealing ring design: the inner sealing ring is thickened and widened, and it is integrated with the plastic, which is not easy to fall off and has a good sealing and heat preservation effect. Vent hole design: The principle of pressure cooker, press the vent hole to seal the box, open the top vent hole before opening the lid, it can be easily disassembled and cleaned. Tight lid: There are safety buckles on both sides of the lunch box, which can be easily fastened with one press, so you don't need to worry about the lunch box loosening. The short buckle design makes the box cover fit closely with the box body for safe handling Ergonomic handle: The ergonomically designed arched handle is more comfortable and convenient to carry, and can be pressed into the bag when not in use, with an elegant design that does not take up space.