Big Bag of Mysteries

Source
This item has a chance to drop from the pandarian champion Norlaxx in Townlong Steppes.

Contains
Big Bag of Mysteries appears to contain items found in other Big Bags: see Big Bag of Arms, Big Bag of Herbs, Big Bag of Jewels, Big Bag of Linens and Big Bag of Skins for possible contents. The items also seem to appear in roughly the same quantities as in these bags. However, Big Bag of Mysteries does not seem to offer items found in Big Bag of Food or Big Bag of Wonders.