NRS big sky 146, Yeti 160 and Coleman ultimate Extreme
Not to stir the fire but this was my experience from a 9 day deso/gray float with 3 coolers. The NRS and Yeti both had 2 3 gallon buckets of Ice. The NRS had all frozen food and 30+ lbs of bagged Ice to fill the cooler to the top. The Yeti cooler was not nearly as full of ice and had milk, frozen food, about 20 lbs of Ice and 3 baskets in the lid for things we did not want frozen. The Coleman Ultimate Extreme 100 qt had 2 4 gallon buckets of ice, 4 gallons of milk and 20+ lbs of Ice on top of it all. We were into the Yeti multiple times a day for breakfast, lunch and dinner. The NRS only once every couple of days, and the Coleman only 3 times towards the end of the trip. We had very little ice on day 8 in the Yeti but still had a couple of good chunks of Ice. I attribute this to the multiple times/day we were into the cooler. The NRS cooler still had cubed ice floating around at probably day 6. On day 8 I took the remnants of one of the 3 gallon blocks from the NRS cooler and added it to the Yeti. I don't think the Yeti could have made it another day plus travel home but may have made it to Green River for a top off. The piece I took out of the NRS was a bit smaller than a 7 lb block from the store. The Coleman extreme still had 1 gallon of milk and ice when we got home, but not much. The Ice from the NRS and Yeti were still on the front lawn when I woke up the next morning.
I thought the Coleman Extreme Marine would do much better. The first time I got into it it was frozen solid but once I took a gallon out it went down hill fast. The Coleman and yeti were always covered up. The only time we got into the Coleman was to retrieve a gallon of milk in the morning then the remaining milk went back into the Yeti. I'm convinced the high end coolers are far superior especially since we put so much ice into the Coleman cooler and only opened it up 3 times.