The new main sack filter located in the dust compartment. The white material filter fits inside lid above the dustbag.
It has a plastic frame inside it to help it keep it's shape and large surface area, where it's a most effective barrier against dust, protecting the downstream filters and the motor and the HEPA filter.
At the moment standard postage within Australia is capped at a maximum of $25! So maximise the saving on postage and buy some packets of or some of the related parts below!