We have an Engel 40lt fridge and decided we needed more fridge space for drinks, didn't want to buy another fridge just wanted to get a better quality esky. There are so many brands we did not know which one to get until we went camping on the murray River earlier this year, another camper had a large evakool icebox for food & drinks, after 3 days he was still pulling out frozen meat, we were amazed. (he also has a smaller one in his fishing boat) http://www.evakool.com/
We bought one soon after, proven to be excellent. Another bonus is they are Australian made.