Large Capacity 304 Stainless Steel Liner This insulated lunch box uses a foodgrade 304 stainless steel inner compartment with flexible layout options: Singlelayer: 1000 ml Doublelayer: 2100 ml Triplelayer: 3300 ml These configurations support generous meal portions and adaptable planning. Versatile Meal Management Leakproof silicone seals and secure locking buckles prevent spills. It is suitable for: Microwave heating* Dishwasher cleaning Refrigerator storage for convenient food handling and versatile daily use. Thoughtful Lunch Box Organization A dedicated utensil storage compartment comes with provided chopsticks and a spoon. The thickened PP exterior provides nonslip stability during transport, helping keep the contents secure. Flexible Stackable Design Choose from single, double, or triplelayer configurations in gray, orange, or blue. Stackable layers measure 22x15x7 cm to 22x15x19 cm, allowing customized lunch carrying and easy expansion as needed. Use scenarios Office or school lunch: pack a complete meal in one box with the option to reheat in the microwave and then store leftovers in the refrigerator. Meal prep and portioning: separate mains, sides, and snacks across layers for organized weekly planning. Travel, commuting, or picnics: stackable design and nonslip exterior make transport simple and stable, with utensils ready at hand. Note: Microwave heating is indicated with an asterisk in the original description.