The Lansinoh Silicone Breast Pump is helpful in situations where, while feeding or expressing milk from one breast, milk leaks from the other breast. The silicone milk tank adapts to the shape of the breast, initiating the natural flow of milk, thus allowing the collection of valuable milk in a simple and efficient way. The Lansinoh silicone breast pump allows close contact with the breast for easy hands-free milk collection, and the suction base and additional neck strap prevent milk spillage. The tank is suitable for all breast sizes. It's lightweight, handy and easy to use.