The Monkey Bag is a quest item. It belongs to Kama. You need the bag for the Quest: Kama's Bag given to you by Kama in the Hovering Markets. Kama says that it was stolen by a thief. The evidence suggests that the thief who stole the bag is a Bathog, for you see one guarding the bag. However, Kama is sure that the thief is Sabre the Panther.