Big Bag

The Big Bag is an item found in Ancient Stone Tablets. It allows your character to carry items, and it mostly just acts as your inventory. If you were to join the game at weeks two, three, or four, however, your character would find a thief at the entrace to the previous dungeons. This thief would give your character a big bag with all of the items from the dungeon, including the heart container the boss would drop.