If I use a box that is the same size as an ebay flat rate mailing box, do I still get the flat rate

I have mailing boxes that are the same size as the ebay flat rate mailing boxes. i am just wanting to know that if i use those, can I still get the flat postage rate when I print out a label

 

Would really apppreciate someone helping me out here.

 

Many thanks

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No. You need to use the correct Aus Post mailing boxes to get the flat-rate prices.

You can select Own Packaging and enter the weight and dimensions of your box. The postage cost is a bit lower than over the counter prices.