Flat items under the size 260mm x 360mm x 20mm 500g can be sent as large letters. $1.20 up to 125g, $1.80 up to 250g and $3.00 up to 500g.

However you don't get cover for large letters. If you register a parcel you get up to $100 cover. But you don't get any cover for sending a large letter via Registered Post.

Advantage of sending items as large letters are lower price and quicker than parcel when sending parcel to state far a way because letters go via air not via road like parcels.