Enchanting Bags are a specific type of bag that allows the storage of enchanting supplies for the Enchanting profession, including dusts, shards, essences, rods, and enchanting recipies that you haven't learned yet. As of Patch 2.3, these bags can now carry oil, elemental essences, motes, primals, and other items made through enchanting, including rods. They were introduced into the game in the 1.10 patch, and several more were introduced in the Burning Crusade expansion.