PackIt Freezable Zuma Can Cooler, Built with EcoFreeze Technology, Collapsible, Reusable, Zip Closure with Adjustable Shoulder Strap, Fits 15, 12 Oz Cans

We liked our Pack It frozen lunch box for holding bottles, it fits 6 bottles though but they have larger bags also. Nice to be able to fit different size bottles, and you out the whole bag in freezer to freeze and it stays cold for a really long time! We still use it now at 1 for trips to the zoo. Mine were eff starting at 8 or so weeks, but they topped out around 8oz of formula per bottle around 6-7 months old, which stayed steady until their solids naturally increased around 10months.