But temperatures didn’t rise above 43 ☏ after four hours in any of the bags, which is still quite cold ( Good Housekeeping had similar results in an extensive test of 43 lunch boxes). Buy FUEL Backpack & Lunch Bag Bundle, Black/ Orange Tech and other Kids Backpacks at. Read reviews to learn about the top-rated Crayola Spectrum Fuel Pack Lunch. Only the Coleman kept the milk below 40 ☏ after two hours. Find a Crayola Spectrum Fuel Pack Lunch Tote - Junior - Orange at Staples.ca. In 2018, we conducted a temperature test using a plastic container filled with ½ cup of milk, and we also concluded that our picks would keep foods cold. But we still think the insulated lunch boxes we recommend will keep foods pretty cold with two ice packs. The USDA recommends keeping food under 40 ☏ if it will be left out for more than two hours. But factors including the size and shape of the lunch box and the starting temperature of the refrigerator may have contributed to this range.
The highest temperature difference was 8 degrees, to a final temperature of 51 ☏. We placed two Igloo Maxcold Freeze Block ice packs above and below a container of yogurt, checking the temperature before and after four hours. We followed the USDA’s recommendation for keeping cold foods safe. Finally, using a food thermometer, we tested how long the insulated lunch boxes kept yogurt cold over four hours.
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