I had an earlier design which was really good but this new design is terrible. The lid doesn't shut properly so if it tilts in my bag it leaks. Also you have to lift the stopper inside and tilt to drink. The stopper often shuts while I'm trying to drink stopping the flow. I think this is due to the angle needed to drink means my mouth pushes up against the stopper. I much preferred the old style with the straw - no tilting my head to drink when I'm exercising. Shame Brita stopped making the filters!