From the Qantas web site... Carry on baggage note Qantaslink dash 8's limit one bag at 4kg...
Route Piece Allowance & Dimensions Weight Allowance
Australian and New Zealand Domestic
All Classes:
2 x 105cm (41in) bags or
1 x 105cm (41in) bag plus 1 x 185cm (73in) non rigid garment bag or
1 x 115cm (45in) bag
7kg (15lb) per piece
All Dash aircrafts 1 x 105cm (41in) bag 4kg (9lb) total
All International (country specific exceptions apply)*
First/Business/Premium Economy:
2 x 115cm (45in) bags or
1 x 115cm (45in) bag plus 1 x 185cm (73in) non rigid garment bag
Economy:
1 x 115cm (45in) bag or
1 x 185cm (73in) non rigid garment bag
7kg (15lb) per piece