Hi

I usually post 500g to 1KG boxes, but there are some small items I want to do in padded mailers. Something like these that fit the 125g-250g Aus post policy:

https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=padded+mailers&_sacat=...

Large letter 125-250g

https://auspost.com.au/sending/send-within-australia/compare-letter-services/regular-letters-cards

But I'm struggling to work out how I do it in eBay and Australia post my Business portal. I don't see a postage policy for this in eBay and when I go to Australia Post and enter the size and weight e.g. 15cm x 20cm x 1.6CM, it comes out at like $8.00.

When the Aus Post site says it's max 3 stamps and $3.60.

What needs to happen?