An esky is a container that keeps things cold, usually used for picnics or camping.
An esky is often associated with outdoor activities and keeping food and drinks fresh.
Examples:
We packed the drinks in the esky for the picnic.
The esky kept the ice cream cold.
I need to buy a new esky for our camping trip.
The esky is full of cold drinks and snacks.
The esky is so cold, it can keep things frozen!
The esky is the best way to keep our food fresh outside.