Bought one at WM last year, have taken it hunting in September and in November.  In September, Oregon, dry camping it worked well with temps around 80 day 50 night.  Used freeze packs to keep cool not ice.  Bottom items in the cooller were still frozen after 4 days.  November hunt, temps 40  days, -10 nights, no problems keeping stuff cole, but also had a bottle of wine in the coller, it did not pop the cork from over freezing.  Great cooler for 1/2 the price of similar types of rot molded collers.