MyPost Business supports multi-package checkout rates for Australian domestic shipments.

Enable “Enable Multi-Package Creation for Domestic Shipments” in your MyPost Business courier settings, then select “Pack each item separately” (previously “Unique Package for each item”) in Settings > Checkout Rates.

Starshipit combines the package prices into the checkout rate. Each package is charged as a separate MyPost consignment.

MyPost Business setup guide:

Checkout rates setup guide:

For Shopify, per-item rating requires Product Catalogue dimensions and account enablement, as explained in the checkout guide.