Badgerboy:
I'd say no, not really.
I bought it because I wanted a smaller pack for summer use. It couldn't take what I'd call full winter kit.
I have my waterproof jacket, Anker battery and leads, 3 Litre Bladder and a beanie hat in there. Some odds and ends in the top pouch (Buff, glasses and the like).
Once a butty box goes in, you miiiiight just be able to squeeze a micro fleece in there. Maybe.