Herbal scented vacuum cleaner de-odouriser individually wrapped. We use them in each unit we service on commercial customers vacuums. One placed in the exhaust of a vacuum cleaner usually lasts about 4 months.
As it's light, maximise the saving on postage and buy a couple of packets of dustbags, or a hose or a new floor tool, or some other accessories! See in related parts below.
At the moment, standard postage within Australia is capped at a maximum of $20!