This lunch box is airtight and has a double locking system to keep your food fresh for hours at a stretch. It is made of high-quality insulating material, which ensures that your food stays just the way you want it to. The containers are space-efficient and have been structurally designed for easy storage. The set is leak-proof, highly durable, easy to clean, and convenient to carry. It also has additional storage space for spoons etc. It is microwave, freezer and dishwasher safe.