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@china2u4u wrote:

I tried that, but because the padded envelope would not fit through the slot, Australia Post refused to post it at letter rates, and told me that it had to be posted as a small parcel < 500g for $7.20. Does your P.O. not use the magical cardboard with slot measuring device to sort out letters from non-letters/parcels?? I wish I had an eBay seller friendly P.O. near me!!

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If you go to the post office, you can get one of those mail cardboard things with the different sized slots, for free

so you can check yourself it your item will fit through the slots and also if your "package" is within the measurement guidelines for a "letter"

I'm guessing your flash drive, when packaged was thicker than 20mm - and that's why it wouldn't go through. annoying eh?

But lots of books are under 20mm thick - maybe not War and Peace or LOTR kinda ones, but if you look around - heaps of em. For example, I sell those EXCEL books that school kids use - they're not really much more than a magazine - A4 size, cardboard cover, but most under 20mm thick and can be posted as a large letter.

surprisingly, a fair few novels are under the 20mm as well