Babies, and especially newborns, need to eat frequently. Whether your child is breastfed or formula-fed, using a bottle when you’re out and about can be easier with a cooler bag. You can store breastmilk or formula in bottles and keep them cold for easy feeding when you’re on the go. Plus, if you pump at work or when you’re out, you can easily store your milk and keep it at the correct temperature. You can also use these bags to store snacks or food that needs to be kept cold as well. They’re just a convenient way to bring milk/food for your child with you when you can’t be at home.