I had an opportunity to use the Engel 65 cooler and saw what it can do at our recent ACK demo day event. I can tell you, these coolers live up to all the hype. The lid on this Engel 65 Quart Cooler is air tight. The latching system provides a good amount of pressure when closing, sealing the lid tightly to the o-ring seal. What a great design, I now see how Engel can claim ice retention for 8-10 days in there coolers.