7 months after the birth of our youngest, we moved 4 states over. During those 7 months wife saved and bagged over 300 ounces of breast milk that we did not want to go bad or thaw out. Conduct a bunch of research, and came to the decision to purchase the AJ40. We pre-cooled the night before just as a safety measure, wasn’t needed, the next day loaded the breast milk, dropped it in the car and headed out, not an issue. Took 2 days for the trip with a young one and everything else, big win for the AJ40, it has been 8 months now since the purchase, and yet again, using it to transport something that cannot be warm, or thawed until use. Solid investment, will be upgrading soon to a bigger one.