I have one small Coleman cooler that will keep ice in it for DAYS. It was given to me a few years ago and I can't find any info on the bottom or sides about what model it is. I have another Coleman cooler that I bought last year that was advertised as a "5 Day" cooler - one of the "Xtreme" models - but it barely keeps ice in it for 24 hours, much less 5 days. I really need a larger food cooler for when we camp, but I have no idea what to buy at this point! Anyone have recommendations? I'm looking for something around 50 to 75 quarts in size.