Renowned Explorer's Rucksack

[ryuhyo]

WoW Freakz item link: https://www.wowhead.com/item=171333/renowned-explorers-rucksack#screenshots
Character name: Hallowsoul
Bug description: i just bought the Renowned Explorer's Rucksack item from the AH and i tried using it. it doesn't register in my appearance tab, so i can't transmog it to any of my back items on my character. i already did the relog and delete cache thing so it must be a problem with the item itself not registering to my tab. the item should register once i clicked on it or put on my back slot but as you can see in the pic in the link below it still hasn't registered itself on my collected appearance tab.

Proof: https://i.imgur.com/I1BN156.png

thanks