As opposed to plastic, glass is friendly to the environment and free of chemicals. Hot foods can be transferred directly to the containers, as no chemicals will leach into the food. Our Delcasa Airtight Glass Container is made of high-quality borosilicate glass with a smooth and beautiful lid. Entirely safe to transfer from freezer to oven in instants. Glass containers won't absorb stains or smells, making it the perfect choice for acidic foods. Glossy surface maintains the tastiness of food for long periods of time. Borosilicate glass is safe for baking in the oven, freezer storage, and reheating. Modular stackable design allows for neat packing in a lunch bag or for storing leftovers in the freezer.Delcasa Airtight Glass Container with 4 sided locking tabs secures the leak-proof lids, BPA-free, secure-snap lid with silicone ring ensures airtight seal for food freshness and 100% leak-proof ability for mess-free transport on-the-go, to the gym, work, and school. This glass container with lid for food storage is dishwasher safe (top shelf recommended) and super easy to hand wash, and can be inserted in the dishwasher too. No efforts to clean! You can use this glass container for storing, freezing, reheating, baking, and serving. It suits homemade baby food, for last night's leftovers, for taking lunch on the go, and packing snacks."