Clarke EZ8 and FA8 floor sander dust bag. This is the bag the sawdust goes into, and it can be emptied by opening the zip.
Maximise the saving on postage and buy several Puregiene toilet rolls a box of Tissues and some soap or maybe some packets of dustbags, or a hose or a new floor tool, or some other accessories!
At the moment, standard postage within Australia is capped at a maximum of $20!