These are perfect for lunchbox coolers. They are small and slim so they do not take up a ton of space, and you can kind of pack them around containers to keep things that you want to keep cold cooler for a longer period of time. In an average-sized lunchbox, they can stay cool for a good portion of a workday. When I was going into the office, pre-covid, I would pack my lunch and usually an RTD protein drink in the morning at about 6 AM. All of the liquid in the blocks was still frozen by lunchtime, but by the time I got home in the evening, (usually between 5 and 6 PM) it was back to liquid. So, that gives you an idea of the time they will stay solid and cold.
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