This kitchen set is airtight and has a double locking system to keep your food fresh for long hours. It is made up of high quality insulating material. The containers are space-efficient and have been structurally designed for easy storage. The set is leak-proof, highly durable, and easy to clean. It is microwave, freezer and dishwasher safe. It's a smart and easy solution to keeping your snacks and spices fresh, with their smell intact.