Plastic, 5 litres.
Not convinced the pourer I found nearby is the correct part, but it just about fits with an effort. OK for storing and carrying.
I'm on Lazy Hill, Kings Norton, B38 9PA.
I seldom check freegle for replies, so if you would like this, please speak to me on my freegle-only number to arrange collection: 07440-324044. Phone may be off if playing chess or in a meeting etc, but I’ll return any voicemail.