My son is 15 months old and we are taking a trip to Yellowstone National Park in a few weeks. We will be moving around a lot and it could be difficult to keep milk cold. And unfortunately, my son doesn’t drink milk cold, so I would also have to figure out how to heat it up at least to room temperature. It’s a nine day trip. I can’t really see why not, even though we never used toddler formula before switching to regular milk. He has an appointment before we leave, so I will ask his doctor about this then, but I just wanted to see if anyone has tried this before? Thanks!