Minecraft wiki entry for Chest, associated text: If shulker boxes are again used, each donkey, mule or strength value 5 llamas with a chest attached to it can carry up to 405 stacks of items (up to 25920 items), and with strength value 5 llamas, each caravan of 10 llamas with inventories full of shulker boxes can carry up to 4050 stacks of items (up to 259200 items).