Green’s Dictionary of Slang

(Aus.) a vagrant’s pack.

1912		Bulletin (Sydney) 8 Aug. 15/1: We dumped our ’Tilders in the bar to take a little rest, / For that ole pad was long an’ ’ot we’d trodden from the West.
1955		N. Pulliam I Travelled a Lonely Land (1957) 234/2: The man on the move devised numerous names for the bluey and its contents: swag, knot, tilda, curse, bag, matilda, etc. and when on the tramp he was variously described as humping the bluey, carrying the knot, waltzing matilda, carrying the tilda [etc.].