Hi!
I've got about 37 litres sitting in plastic water bottles. I really should transfer to glass demijohns to mature until spring.
As I have space for two FVs in my fermentation fridge, next year I'm splitting the brew into two 12 litre batches - this year it was pushing the capacity of a single FV.
I might also try crushing the blackberries and collecting the juice, rather than use the whole berry. However, this may prove to be too arduous a task.
I'm about ready to bottle the blackberry brandy that's been sitting in the back of my wardrobe since August - it's a really lush liqueur.