To store an item, simply trade the item to the NPC. The NPC will only accept one item at a time. It costs nothing to store and item, but retrieving an item requires a fee of 250 gil. To retrieve your item, talk to the NPC and select the item from within the presented categories. Items can be stored at one NPC and retrieved from another. Unlike with the Armor Depository, you will not receive a for the items traded.