Most back pieces have no model on the character. Some exceptions are the engi starter pack and the Halloween event books.
The preview / equipment screen never shows back items, so there’s that.
As mentioned above, some other back items (the braces) don’t have visual models either.
Backpacks and quivers should definately show, though. Unless you’re only previewing them.
Not affiliated with ArenaNet or NCSOFT. No support is provided.
All assets, page layout, visual style belong to ArenaNet and are used solely to replicate the original design and preserve the original look and feel.
Contact /u/e-scrape-artist on reddit if you encounter a bug.