Bombchu Bag

The Bombchu Bag is an item from Phantom Hourglass. In order to carry or buy Bombchus, Link must obtain the first Bombchu Bag from inside the Goron Temple, which will let him carry 10 Bombchus. This trait is unique to the game because, in both Ocarina of Time and Majora's Mask (the first games where Bombchus appeared), the Bomb Bag is enough to support bombs of any type, while in Twilight Princess the similarly-working Bomblings can occupy any of the three Bomb Bags obtainable.

Bombchu Bag Locations
As mentioned before, the first Bag is kept at Goron Island as its dungeon item. The other two bags can be earned in any order: the Goron Island Store will put a Bombchu Bag upgrade up for sale for just 1000 Rupees. The other Bombchu Bag, can be won by completing the minigame at Dee Ess Island in 35 seconds or less. Whichever bag is collected first will yield an upgraded capacity of 20 Bombchus, while the other will allow a 30-Bombchu stock.