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“Argh! I dropped it! SPLOOSH! A fat sack of precious coins, right into the ol' drink...”
Shy Guy, Paper Mario: The Origami King

The Heavy Bag is a special item in Paper Mario: The Origami King. It is one of several treasures found within the depths of The Great Sea. It belongs to a Shy Guy who appears to have dropped and lost it. Mario must travel to the Shy Guy on an island near Toad Town port and speak to him. He simply tells Mario he has dropped the sack into the ocean. Once the Super Marino has been obtained from the museum and attached to Sea Captain Toad's boat, Mario is able to dive down in front of this Shy Guy.

They are able to look around and use the arms of the submarine to find and pull in the bag. Olivia decides it must belong someone, so it is best not to peek inside. Mario is then able to speak to the Shy Guy nearby to return it. He rewards Mario for his honesty with 1,000 coins, promising to never let the bag out of his sight again.