Material: Built with food-grade 304 stainless steel interiors for safety and durability, wrapped in an insulated plastic outer layer.Design: Modular, stackable containers that allow you to pack different food items separately without mixing flavors.Leak Protection: Features airtight lids with built-in silicone sealing rings and pressure relief valves for easy opening.Thermal Performance: Offers double-walled insulation to hold food temperature for a few hours. The individual containers are typically microwave-safe (outer plastic shield removed depending on exact model guidelines) for quick rehe