This item is currently not available in the Guild Wars 2 Api and you are seeing the last know version. The item has either been removed from the game or needs to be rediscovered.
Masterwork
Container
This backpack cover comes with a simple back strap for ease of wearing if you don't have another back-slot item. Double-click to unpack.
"description": "This backpack cover comes with a simple back strap for ease of wearing if you don't have another back-slot item.
Double-click to unpack.",