If only Dennis Mitchell’s parents had an Esky instead of a picnic basket. The syndicated Dennis the Menace comics appeared in Australian newspapers from the 1950s. The portable Esky was introduced to the Australian market in 1952 by O’Malley’s. The name has become the generic term in Australia for portable ice coolers (although today it is trade marked by another company).
Check out this link to the Esky and browse through other objects in the collection of Sydney’s Powerhouse Museum.