The clip and close lids feature an integrated seal to ensure no gaps or food traps. The patented, unique seal is 100% leak proof and airtight, keeping food fresher for longer. Stackable lids, freezer, dishwasher and microwave safe, make storage efficient and secure. Oven safe borosilicate glass base is oven safe to 420C. Lid is not to be used in the oven. As well as convenient storage the glass container is ovenproof and is perfect for cooking meals. Compact size, ideal for a single portion oven baked dish, keeping left over vegetables fresh or a pasta salad for lunch.