Colossal Bag of Loot

Colossal Bag of Loot is a quest reward. The bag usually provides a character with food, drink, and an or  quality item.

Source
This item is a reward from the quests:
 * Secrets of the Colossus - Regal
 * Secrets of the Colossus - Zora
 * Secrets of the Colossus - Ashi