PREMIUM BOROSILICATE GLASS:Our glass storage containers are made from premium borosilicate glass, which is stronger than others' glass food storage containers, safely 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 make 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 USER FRIENDLY: Easy to use and easy to take care of, as it can be used in the microwave, freezer, dishwasher, and oven. Take off the lids before placing in oven and microwave SPACE-SAVING: The food storage containers have stackable design, can keep refrigerator, home and kitchen organized, and leave more space on your kitchen slabs and cabinets