From the Super Mario Wiki
Artwork of the Goodie Bag
Goodie Bag is an item from Super Mario RPG: Legend of the Seven Stars that can be used only in a fight. Every time it is used, coins are added to the total coins gained in that fight. There are infinite coins in a Goodie Bag, but it can be sold for five hundred and fifty-five coins.
This item can be found in Booster's Tower by jumping on top of a certain Treasure Chest, then jumping again to reveal a hidden treasure chest containing this item.
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