Ok hands up if you've never heard of Ésky'? - no one - didn't think so. Well just in case you don't, Esky is an Australian brand of portable coolers. The term "esky" is also commonly used in Australia to generically refer to portable coolers or ice boxes and is part of the Australian slang, in place of words like "cooler" or "cooler box" and the New Zealand "chilly bin".