Women's Health and Wellness - Drive, Pure Expressions Insulated Cooler Bag : The Pure Expressions cooler bag is designed to ensure your breastfeeding experience is simple and organized while on-the-go! The cooler bag with leakproof, waterproof, warm/cool insulation includes four cooler packs, and two 6-oz bottles. It's ideal for transporting milk to and from work or daycare, and perfect for traveling! Heat and cold performance tested.