Creating somewhat of an overflow. Had this a couple of times, cant precisely recall how I did it. Once I had full bags and once I had full mail. I used an item and due to having no free space it seemingly disappeared. Logged back in it still was there.
How do you "push" items out of your inventory? Lets call this the void. I assume the same "works" with the void banker (regardless of the similar term, but rather having the same mechanic) havent had this with a regular bank or guild bank yet.
Something "changes" the structure of items when it gets into the mail and into the void bank... but what exactly?