AusPost Satchel Optimizer
Compare Australia Post flat-rate satchels against your own packaging to find the cheapest shipping method.
What does the AusPost Satchel Optimizer do?
Compare Australia Post flat-rate satchels against your own packaging to find the cheapest shipping method.
How to use the AusPost Satchel Optimizer
- Upload: Select or drag-and-drop your raw shipping label PDFs into the upload zone.
- Configure: Choose your preferred output layout, such as 4x6 thermal or 4-up A4 grid.
- Generate & Download: Click process to instantly generate and download your optimized, print-ready labels.
Frequently Asked Questions
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What are Australia Post flat-rate satchels?
They are prepaid satchels (Small, Medium, Large, Extra Large) that allow you to ship up to 5kg anywhere in Australia for a fixed price.
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When is my own packaging cheaper than a satchel?
For very light items (under 500g) traveling locally or within the same state, base rates using your own packaging are often cheaper than flat-rate satchels.
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How does AusPost calculate volumetric weight?
Australia Post uses a cubing divisor of 4000. The formula is (L x W x H in cm) / 4000 = volumetric weight in kg.
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Can I stretch a satchel over a large item?
No, if a satchel is stretched beyond its maximum allowable dimensions, Australia Post may reject it or charge an underpaid postage penalty.
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Do flat-rate satchels have a volumetric weight limit?
No, the primary benefit of the "If It Packs, It Posts" satchels is that they ignore volumetric weight, as long as the item fits and is under 5kg.
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Does eParcel offer the same satchel rates?
eParcel merchants often negotiate their own tiered rates, but the flat-rate satchels remain an excellent benchmark for heavy interstate shipments.