I can find very little information on the sizes of alembics, even on the general internet. Near as I can tell, most alembics (probably?) range from 3 liters to 20 liters.
The price list has both "Alembic" and "Alembic, Greater", but I'm not sure if the difference is in size or material. The greater alembic is made of glass and used exclusively for
Philtering, but it could also be bigger.
It might help if I knew more about why you are asking. Are you concerned about capacity? Portability? Weight? How specific do you need your numbers?
That's the best I can do to answer that for now, and I'm not at all confident about anything I just said. If I find more solid information I'll let you know. For now, I'll defer to anyone who has a stronger opinion on this