It really isn't very big - I have mine it a bedside drawer. Maximus is so thick that you don't have to worry about it leaking unless you really press on the bottle. If my mind isn't playing tricks on me, the bottle is about 2-3/4" in diameter and 4-1/2 to 5 inches tall (including pump), and I think it's closer to 4.5
I think mine's good to 2013 or something (I'm not at home now, but I can check later), so I wouldn't worry about it going bad