The WooCommerce Smart Send shipping plugin integrates Australian shipping cost calculations for 'Smart Send' online shipping.
Shipping classes (eg 'Carton', 'Tube', 'Satchel') can now be set on a per-product basis - just go to the 'shipping' tab on the 'Edit Product' page. This also includes new 'priority' and 'prepaid road' satchels.
If you choose either 'Best fixed price road' or 'Best priority', the calculator will choose the smallest-fitting satchel (comparing maximum weight and dimensions of each possible satchel with that of the product).
Support is available at the Codex Media website;