Twilight Princess Upgrades
In Twilight Princess there are three pieces of equipment that can be upgraded: the Bomb Bag, the Quiver, and the Wallet. Link can also obtain an upgrade of sorts to his armor in the form of the Magic Armor. Each piece of equipment, along with its additional upgrades, are listed below.
Wallet
Original Wallet
Location: Ordon Village
The first Wallet will be available to Link immediately upon beginning the game at Ordon Village. In the Gamecube and Wii versions it holds 300 rupees. This was changed to a max of 500 rupees in the HD version.
Big Wallet
Location: Agitha's Castle
After clearing the Twilight from Lanayru Province, head over to Castle Town, and into Agitha's Castle. Speak with her, and she'll ask you to collect Golden Bugs for her. Find one Golden Bug across Hyrule and give it to her. She will give Link the first wallet upgrade, the Big Wallet, which will hold up to 600 rupees.
Giant Wallet
Location: Agitha's Castle
After collecting all 24 Golden Bug, head over to Agitha's Castle. Give her all 24, and she will give you the final wallet upgrade, the Giant Wallet, which will hold up to 1,000 rupees.
Bomb Bag
Original Bomb Bag
Location: Kakariko Village
After clearing the Goron Mines, head over to Barnes Bomb Shop in Kakariko Village. For 120 rupees you can purchase the first Bomb Bag, already filled with regular Bombs.
Second Bomb Bag
Location: Iza's Rapid Ride
After clearing the Twilight from Lanayru Province, head over to Upper Zora's River. Speak with Iza, who is next to the house above the river, and she'll invite you in to help her with a problem. Bomb the boulders inside with a bomb arrow, and she'll have you hop in the boat to help clear some more down the river. Before you begin she'll give you the second upgrade to the Bomb Bag.
Third Bomb Bag
Location: Zora's Domain
After clearing the Twilight from Lanayru Province, head over to Zora's Domain. If you can't change to wolf form, go to the northernmost point of Hyrule Field, and through a cave that leads to Zora's Domain. Bomb the boulders on the way up to get to the top. Once inside the throne room, equip the Zora Armor and Iron Boots, and sink to bottom. Here you'll find a large boulder; blow it up with a Water Bomb. Inside is a Goron who will give you the third Bomb Bag upgrade.
Giant Bomb Bag
Location: Zora's Domain
After clearing the Twilight from Lanayru Province, head over to Upper Zora's River. Speak with Iza, who is next to the house above the river. She will invite you in to play her game, Iza's Rapid Ride. The goal is shoot down 25 pots that are strewn across the river, with yellow pots being worth 1, red being worth 2, and hitting a wall resulting in -1. You need to get at least 25 out of 30 points to win the game. At the bottom of the river Link will receive the final upgrade, the Giant Bomb Bag.
Quiver
Original Quiver
Location: Goron Mines
In the Goron Mines, after defeating the mini-boss Dangoro, Link will enter a room containing the Bow and Arrow. It will come with the first Quiver, which can hold up to 30 arrows.
Big Wallet
Location: STAR Game
After clearing the Twilight from Lanayru Province, head over to Castle Town, and into the STAR Game. The goal of this game is to collect all of the stars in less than 30 seconds. The Clawshot can be used to move around the cage, and to collect the different stars. Once completed, Link will receive the second upgrade, the Big Quiver, which will hold 60 arrows.
Giant Quiver
Location: STAR Game
After clearing the City in the Sky, and finding the Double Clawshots, head back over to the STAR Game in Castle Town. This time there are even more stars to collect in the game. Use the Double Clawshots to get around the cage, progressing from bottom to top. Complete the game in under 90 seconds to receive the final upgrade, the Giant Quiver, which will hold 100 arrows.
Magic Armor
Location: Malo Mart (Castle Town Location)
The magic armor requires a series of tasks to obtain.
1. Donate 1,000 rupees to the Elder Goron in Kakariko Village Malo Mart to help restore the bridge to Hyrule Castle Town.
2. Accept their mission and bring the barrel of water to the Goron at the bridge.
3. Throw the barrel of water on him and he will give you a heart piece.
4. Return to Malo Mart and donate 200 rupees (only if you completed the last two steps, otherwise you will have to pay 2000 rupees).
5. Wait until you receive a letter talking about the new Malo Mart in Hyrule Castle Town.
6. You can now buy the Magic Armor for 598 rupees.