Introducing Dr. Brown's Options: The market's first convertible bottle that can be used with or without the vent system. The new vent system is designed to grow with baby, and recommended to experience all the health benefits of the bottle., , Includes:, - 3pcs 250 ml Bottles, - 2pcs 120 ml Bottles, - 2pcs L2 Nipples, - 2pcs Storage Caps, - 3pcs Cleaning Brushes