1)Wash the lunch box after each use with warm water and mild detergent. Use a soft sponge to avoid scratching the stainless steel surface. 2)After washing, make sure to dry the lunch box completely with a soft cloth to prevent water spots and rust formation. Leave the lid open for proper airflow if storing for an extended period. 3)Store your lunch box in a dry, cool place. Ensure the lid is properly closed, but avoid sealing it tightly when storing food for long periods to allow air circulation and prevent moisture buildup. 4)Although stainless steel is durable, avoid dropping the lunch box or subjecting it to high impacts, as this could cause dents or damage the lid and seal.