Durable Materials: The interior is constructed from SUS 304 stainless steel, known for being hygienic, corrosion-resistant, and easy to clean [5.5, 5.6].Thermal Insulation: The containers utilize double-wall vacuum insulation technology designed to keep food hot or cold for extended periods [5.5, 5.9].Leak-Resistant Seal: Each tier includes a silicone seal to help prevent spills, though it is not recommended to invert the container entirely [5.5, 5.15].Versatile Storage: The multi-tier, stackable design is suitable for storing various foods like rice, soup, or noodles [5.5, 5.9].