Yep, that stench, I almost evacuated the house yesterday. My bag just kept filling, with REALLY 'bad shit' (sorry, couldn't help myself). Each empty, I was nearly puking at the smell, intact it was so smelly that I could smell it all day, the smell seemed to be escaping from my bag all day and I felt I was literally walking around in a fart cloud. I checked everything thoroughly for leaks, tears or spills, but nothing. I have to assume the smell was just coming through the filter. Still fell like I smell today, but at least when I empty, the output is no where near as smelly! Infancy today it has a vinegarish smell! All a bit strange really!