Okay fashion, if you haven't already done so pruchase the satchels from the Australia Post eBay store. They cost $1.25 for five, or $3.00 for twenty.

Once you get them, THEN use C&S. If you are, as hogs postulated trying to use C&S labels with standard AP satchels, then you are paying MORE than double.

If this is the case, then package the item up in your own parcel - you will already have paid $6.20 for postage, so no point paying for a prepaid satchel on top of that.

Also have a look at AP's C&S site. A lot of hard work, because AP don't understand logic and finding anything on their site is like swimming in treacle. Which is why I'm not going to hunt up links.