HIGH QUALITY BOROSILICATE GLASS:Our glass storage containers are made from high quality borosilicate glass, which is stronger than cheaper glass food storage containers, go straight from the refrigerator to the microwave or oven to the table.PORTION CONTROL FEATURE:The portion control feature of the divided glass lunch containers allows you to regain control over your meals. The two compartments glass containers make it easy to organize your meals and keep your diet plan.AIRTIGHT SMART-LOCKING LIDS: MCIRCO Glass food storage containers use snap lock lids that comes with silicone seals to ensure your meal prep food will last much longer than normal plastic food storage containers. These lids are easy to use and will stop leaking. These lids will not break or slowly stop working.FOOD GRADE: Easy to use and easy to take care of, as it’s can be used in the microwave, freezer, dishwasher, and oven. Take off the lids before placing in dishwasher, oven and microwave for better maintenance.100% CUSTOMER SATISFACTION: If you receive cracked products or you are not 100% satisfied with our products, please feel free to contact our customer service. We will give the best solution for you within 24 hours.