If you send an item 5kg or under in Australia, using our flat rate packaging range, postage is based on the size of the package, rather than the weight and destination.

If you send an item 5kg or under in Australia, using our flat rate packaging range, you’ll pay the flat rate postage based on the size of the package, rather than the weight and destination.

See below for an overview on flat rate postage costs, or visit Send parcels in Australia for more information.

Small

• Regular (Parcel Post): $10.95 + packaging
• Express Post: $14.45 + packaging

Medium

• Regular (Parcel Post): $14.95 + packaging
• Express Post: $18.95 + packaging

Large

• Regular (Parcel Post): $18.95 + packaging
• Express Post: $23.45 + packaging

Extra large

• Regular (Parcel Post): $22.85 + packaging
• Express Post: $31.35 + packaging

If It Packs, It Posts is sometimes a name we give to our range of flat rate packaging.

So, If It Packs 5kg or under in our flat rate packaging, It Posts in Australia for a flat rate!

We have a range of Australia Post-branded packaging eligible for flat rate postage:

• Prepaid satchels
• Flat rate satchels
• Mailing boxes
• Padded mailers
• Tough bags
• Mailing tubes

To make it easy, we’ve broken it into small, medium, large and extra large sizes.

You can still send it using our flat rate packaging, but it won’t be eligible for flat rate postage.

When sending a parcel 5kg and over, or overseas, postage is based on the weight or cubic weight (whichever is greater) and the destination. Read our guide on how to calculate your postage, or use our online calculator to estimate the postage price and delivery time to send your letter or parcel within Australia or overseas.

Cubic weight is the cubic volume of a package, multiplied by 250.

To calculate:

• Measure the package dimensions (length, width and height) in centimetres
• Calculate L x W x H, then multiply this by 250
• This final result is the package’s cubic weight, in kg

Actual weight is the physical weight of your package when it’s put on the scales. It’s usually measured in kg.

Chargeable weight is the weight we charge for postage. It’s whichever is greater between cubic and actual weight. So, if a package’s cubic weight is 15kg and actual weight is 10kg, its chargeable weight is 15kg.

Read our guide on how to calculate your postage, or use our online calculator to estimate the postage price and delivery time to send your letter or parcel within Australia or overseas.