K2 will form a vacuum like the Yeti, if the drain plug don't leak. They need to put a gasket on them, like Yeti.
I have 2 Coleman Extreme 5 day ice chests. They will not hold ice as long as the Yeti or K2. They are cheaper and hold ice about half as long as the high end coolers.
There is another high end company that builds custom coolers. Icy Tek, but they don't have a good sealing gasket on the lid like K2 or Yeti.
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