Catalogue Express Post The yellow Express Post bags are Australia Post's discounted air mail parcel service. This is an overnight service between most CBDs, and two to three days for almost all other parts of Australia. This is a good alternative to the regular Australia Post service because, for a minimal amount above our postage charge, you get prompt delivery, and a tracking service should things go wrong. We think it is well worth the extra cost for customers outside Western Australia. Costs: $7.20 for up to 500g     (small Express Post bag) $10.10 for from 500g to 3kg     (large Express Post bag) $11.90 large volume bag           (where the volume is too great for the large Express Post bag) Back to General Information