Electric Portable Coolers, Portable Coolers for Fishing, Portable Coolers on Wheels and Large Capacity Portable Coolers. Igloo Cool Box conserve ice longer than any other cooler on the market. When filled with ice and left unopened, this cool box can maintain a temperature of 0ºC inside them for 4 or 5 days, depending on the model. Quality is our first objective, which is why IGLOO COOL BOXES possess the most advanced thermo insulating containers on the market. They also boast UV protection and a protective layer against stains and bad smells.