We use Dr Brown's bottles and have this cooler bag:
https://www.toysrus.com/product/index.jsp?productId=2970572
It holds 4 (8 oz.) bottles and comes with an ice pack. I also bought extra icepacks for backup and I usually slip an extra one in the cooler bag.
Re: Dr. Brown Bottle users....
We use Dr Brown's bottles and have this cooler bag:
https://www.toysrus.com/product/index.jsp?productId=2970572
It holds 4 (8 oz.) bottles and comes with an ice pack. I also bought extra icepacks for backup and I usually slip an extra one in the cooler bag.