The Extra Large Bag is a one-time pickup that permanently adds 10 extra inventory slots to your character. It is easy to miss since it sits in an out-of-the-way spot with no quest marker pointing to it.
Location
The bag is found in the Hills of No Return, located northeast of Hernand Town. Specifically, it sits next to a ruined wagon southwest of the Arboria Craftshop.
How to Get There
Fast travel to the Abyss Nexus near Karin Quarry (the closest warp point).
Head northeast past Hook Rapids.
Continue into the Hills of No Return.
Look for a ruined wagon on the road southwest of the Arboria Craftshop.
The Extra Large Bag sits on the ground next to the wagon.
Important Notes
Picking up the bag immediately adds 10 slots to your inventory. There is no animation or confirmation prompt.
If your inventory is completely full, you may need to free up a slot before the pickup registers.
This is a one-time collectible. There is only one Extra Large Bag in the game.
The area can have hostile enemies, so be prepared for a fight on the way.
See Also
Inventory Expansion Guide (complete overview of all bag sizes, vendors, and storage options)