I have had good luck with the Igloo super kool at Lake Powell--got 7 days in 100 degree weather (the ice chests were in the cockpit and covered with a towel, which was peroidically dampened.)I I am really surprised that there was no insullation at all. The super insullation is very expensive. For example if you used vacuum panel insullation and did it properly it could easly cost over $2000 for an ice chest. If you want a good ice chest--make one. Use 2 to 3" of closed cell foam. Start by building a box out of door skins, cover it with epoxy/fiberglass. Inside first a layer of heavy alumium foil, then put a vapor barrier of at least 20 mil plastic, then cut the sheets of foam so that they fit exactly-=fill any corners with pour in place foam. Next another layer of 20 mil vapor barrier, and build an inside box--fiberglass or SS. The lid should also l have 2 to 3" of foam, fit down inside of the walls and be double gasketed with cam or compression latches. We had a freezer box which was built this way only with 6 to 8" of foam. When we lost the genset, we filled it with ice--and after three weeks there was still some ice left. Bob Austin