The Wind Waker Upgrades
In The Wind Waker there are essentially five sets of upgrades that Link can obtain to several items he obtains throughout the game. These include upgrades to: the Quiver, Bomb Bag, Wallet, and Magic Meter. There is one last upgrade, which corresponds to learning the Hurricane Spin. This move will allow Link to use the sword in a different means to attack more enemies at once. Each item, along with their additional upgrades, are listed below.
Quiver
Original Quiver
Location: Tower of the Gods
This Quiver is obtained when Link receives the Bow & Arrow from the Tower of the Gods. It is the smallest Quiver, holding only 30 arrows.
Bigger Quiver
Location: Thorned Fairy Island
This is the first Quiver upgrade that Link receives, and is found on Thorned Fairy Island (G4). Pound the stakes blocking the entrance with the Skull Hammer and then enter. Speak to the fairy who will give Link the upgrade, allowing him to carry up to 60 arrows.
Biggest Quiver
Location: Western Fairy Island
The second and last upgrade Link can receive is found on Western Fairy Island (A3). Once Link gets there, he can pound the stake with the Skull Hammer, which will cause the flames blocking the entrance to go away. Link can then head inside to receive the upgrade, allowing him to carry up to 99 arrows.
Bomb Bag
Original Bomb Bag
Location: Windfall Island
The Bombs are the primary reward during the quest to find Jabun, while the Pirates are stalled at Windfall Island. Link will obtain them from the Pirates after they steal them from the Bomb Shop, and after playing Niko's game in the Pirate Ship. This will give Link the first Bomb Bag, which holds up to 30 bombs.