Spoils Bag

The Spoils Bag is a bag obtained early on in The Wind Waker.

Location
The Bag is found inside Tetra's Ship. To get it, Link must beat Niko's rope-swinging "challenge".

Uses
The item is one of the game's three unique bags capable of storing other items, saving space in the main Inventory. This bag in particular holds items dropped by enemies.

It is essential to progress through the game, as Link needs to collect 20 Joy Pendants to give to Mrs. Marie for the Cabana Deed. The deed is required to access one Triforce Chart, therefore making the Spoils Bag a mandatory Quest Item.

Trivia

 * The face on the Spoils Bag is highly similar to the face of Bogmire, a boss from Luigi's Mansion.