I've never seen that done, and I don't recommend it. I doubt they even allow it since that is more a provision than a piece of luggage. Have you seen how luggage is transferred to a ship? It is tossed into transfer bins that are the size of a pick-up truck bed and three times as tall. As these bins get filled with suitcases, they are then moved aboard the ship by forklift. Not good odds for the survival of a case of water.