Expandable top layer: The expandable top layer is designed to hold baby milk storage bags and breast pumps and can be easily expanded with a reinforced zipper from 1" to 3". The bottle bag measures W9XD7"XH9"-11"(Expandable). Leakproof & study: Our breastmilk storage cooler travel bag comes with an icepack. It is made of water-resistant material, thick PEVA insulation, and seamless ultrasonic welding technology to prevent leakage. It is also easy to clean. Spacious main compartment: The main compartment can hold up to 6 baby bottles up to 9OZ and is compatible with various bottle brands. The height of the bottom main compartment is 8", providing spacious space for your baby's feeding needs. It is compatible with Dr.Brown, Medela/NUK/ Comotomo/ Tommee/ Philips Avent baby bottles. Convenient multi-pockets: The cooler bag features two side mesh pockets and a front zipper pocket, providing convenient storage for personal belongings and daily essentials and enhancing your overall experience. Multiple Carrying Choices: Comes with detachable and adjustable straps for multiple carrying options. It can also be used as a lunch bag. Additionally, it is an excellent gift for breastfeeding moms. Black Breastmilk Cooler Bag with Ice Pack Fits 6 Baby Bottles