Smash 20 oz microwave safe stainless steel lunch box is perfect for healthy lunches and snacks, meal prep. Featuring a spacious single compartment, you can reheat your meals simply and safely with our innovative stainless steel microwave. Microwave safe: Yes, you read that correctly. Our stainless steel containers can be used in the microwave, simply remove the lid and heat in 1 minute increments, stirring in between until you reach the desired temperature. Always be careful and use a oven mitt when removing the container. UNIQUE COMPARTMENT The one-compartment base is perfect for holding sandwiches, pasta, salads, fruits, last night's leftovers or a variety of lunch options. LEAKPROOF / AIRTIGHT - The leak-proof silicone perimeter seal prevents unwanted leaks and spills, while being airtight to retain freshness. For better sealing, close the lid with open clips, apply pressure to the center of the lid to expel the air, then lock the clips in place. When opening, release the clips and use the tab in the corner to open the lid. DURABLE STAINLESS STEEL - Designed with food grade stainless steel and paired with PCTG lids that give glass-like clarity without the risk of breaking, our microwave safe stainless steel range has been developed with high quality durable materials that are built to last. So you can choose to reuse them again and again.