Bottomless Coin Sack

The Bottomless Coin Sack is a magical item in Wario Land: Shake It! that holds infinite coins and whenever shaken will summon the coins out the coin sack. This seems to be a very desirable treasure for pirates (or any other greedy person). The Bottomless Coin Sack resides in the Shake Dimension (a dimension within an ancient globe) and is basically the center of the Shake Dimension's life. The Bottomless Coin Sack is stolen by the pirate known as the Shake King. In the first cutscene, the Shake King shakes with this precious artifact, and the Bandineros around him hops in happiness. The Shake King also said it is a legendary treasure. Captain Syrup, the female pirate, wants to possess this item for herself. However, she doesn't want to do any of the dirty work herself, so she "hires" Wario.

In the last cutscene, all Merfles are happy that the Shake King is defeated. Captain Syrup reminds the Merfle Wario met about a agreement, and it almost forgot and came along. Merelda thanked Wario, but he threw her away and grabbed the coin sack. He shaked the coins out the treasure, also awhile the credits. But, after the credits, the coin sack is gone, and the coins Wario has shaken seems to be sucked away by a vaccuum from Captain Syrup. Merfle came to explain their agreement, and Wario attacks Merfle.

Trivia

 * Coincidentally, there was a similar item in Super Mario RPG: Legend of the Seven Stars, which was a golden treasure chest created by a Magikoopa (possibily Kamek), and it contained an infinite amount of coins.