There are 2 kinds of them (the big ones and the 5l ones)
And right now the smaller 5l ones would be more useful than the big ones since we already had barrels for that. Its annoying and silly having to make bier-wurst and keep filling all the tankards and bottles, not to say that its silly people use buckets to store wine.
So I suggest a small demijohn which needs 10-12 glass and 4 plant fiber (for the basket like materials surrounding the glass)
and the inability to store wine in buckets, or if you do they turn to vinegar.