The Elvie Pump Breastmilk Storage Bottles come in a pack of 3, providing a convenient solution for storing breastmilk. These clear bottles are designed with features such as connecting to a phone app for tracking, being BPA free for safety, and allowing for hands-free pumping. Powered by batteries, these lightweight bottles weigh only 0.070 lbs, making them portable and easy to use for busy mothers on the go.