These are super cute!  Right now ebay has these Travel Thermal Feeding Bag Baby Milk Bottle Keep Warm Holder Plush Pouch Cover for only $2.69.  Plus, pay $0.99 shipping.  So you’ll score these for only $3.68 shipped!

To give you a price comparison, these are selling for over $12 on Amazon.  These would be great to have on hand for those car trips and vacations you have planned!