Lock&Lock features high quality plastic containers with nestable bodies to minimize space during storage. Our patented four-wing locking system hooks onto the lid to lock securely with the slightly raised lip around the container. With equal pressure being released on all four sides of the hollow silicone seal, it creates a unique system that ensures the greatest air and water tightness. Lock&Lock round is ideal for salad, fruit, vegetable storage, and much more. Moreover, it helps save money because it keeps food fresh for a long time compared to other storage containers. Have peace of mind with Zen style Lock&Lock, we operate with the principle of preserving the environment and humanity.