Windbag was foaled in 1921 and was by Magpie out of the mare Charleville (by Charlemagne). He was an early product of the great nursery at Kia Ora Stud under the expert tutelage of Percy Miller and Bert Riddle.

His main claim to fame came in 1925 when, in front of a crowd of 106,829 people he won the Melbourne Cup by half a length from the 7/4 favourite Manfred, carrying 9 stone 2 pound at 5/1 and ridden by Jim Munro.

The Melbourne Stakes winner Pilliewinkle was third a length further back from the second placegetter.

He set a new record time for the event of 3.22.75.

This was also the first Melbourne Cup broadcast by the ABC.

Over his career (36 starts) he won 18 races, ran 10 placings, and won a total in prize money of £35,939.