Originally Posted by olsaltydog

Yup, you must have been editing when I posted. Pre-cooling a cooler is ideal for letting the cooler perform the way it was designed. I will say that majority of the coolers on the market like igloos or colemans will cool faster due to the thinner insulation, causing less melting at first, but will be affected sooner then others by the lack of insulation. The thicker coolers like RTIC, yeti will take more time to cool the inside which will cause the ice to melt faster at first but once chilled properly, they will hold the ice inside longer because it takes a while for the outside to affect them.

We call those sacrificial bags.