I got a nice rectangular shaped soft cooler bag at Target before my last trip (was about 6.99). I put the baby bottles, etc., in it. I was allowed through security with all my baby stuff and liquids (3 bottles of liquid, plus a bottle of apple juice, plus yougurt, apple sauce, and 3 jars of baby food). I expected them to ask me why so much, and have to prove I would be traveling for the next 24 hrs, but they never asked. The TSA rule is you can take liquids for infants/toddlers as needed for the reasonable length of your air travel. I've never had trouble in the US - only in Europe - where they do make you eat from every jar, and drink from every bottle, before they let you through security.