1、EXQUISITE CRAFTSMANSHIP: Our baby bottle thermal bag is made of polyester and lined with aluminum foil, durable and long lasting for extended use. 2、INSULATION: This breast milk cooler bag features insulation to keep milk at the optimal temperature for 3 to 4 hours. 3、PORTABLE: Designed with a handle, this milk bottle warmer is easy to carry and can be hung on your bag or baby stroller for convenience. 4、ZIPPER: The steel zipper around the cooler bag provides a tight sealing and insulation, protecting your milk from external temperature changes. 5、VERSATILITY: This insulated bag is perfect for storing and carrying baby bottles, breast milk, or formula, ensuring your baby always has the right temperature milk on the go. Item Type: Bottle Warmer Bag Material: Polyester Product Size: Height: Approx. 22cm / 8.66in 1 x Bottle Warmer Bag