Postage Rates 2024 Flat Envelope Delivery. Postal rates are also calculated by reference to the weight, shape, size and destination. These prices are for postage within australia only and don’t include the price of packaging.
Find out more about an post rates, including our international rates and our package rates. You can send up to 4 lbs using priority mail international flat rate envelopes and small flat rate boxes, and up to 20 lbs.