I have used my Bison 72 quart cooler…
I have used my Bison 72 quart cooler three times and thus is what I have experienced. If left in direct sunlight, the lid warped to the point that the gasket was not sealing in the front center. When I moved the cooler into the shade, the lid returned to it's original shape. After precooling, I added 30 pounds of ice along with precooled drinks, meat, and veggies. I was careful to limit the opening of the lid as few times as possible. I was surprised that after two days, the ice was nearly melted. The next time I used it, I was more careful keep the cooler in the shade. The results were about the same as before. I put a 10 pound block and twenty pounds of cubes. They were almost gone in three days. After contacting Bison Warranty Department, I am impressed with their customer service. It turns out that I had received a cooler that was defective. That does happen in the real world. They are making it right and that makes me very happy. 5 stars!