Netherweave (16), Imbued Netherweave (18), Frostweave (20), and Embersilk bags(22) were all Bind on Equip. That makes them smaller than Illusionary Bag, but it also makes them transferable after one alt has finished with them. Royal Satchels are a 24 slot Non-Bind-on-Equip bag. In Mists of Pandaria, tailors can now make Royal Satchels with Imperial Silk. Anyone making gold in World of Warcraft needs the biggest and best bags in the game.