I've seen those too. I don't care whether or not they have a filter (my water bottle does), but I do like that it just makes it way more convenient to top off t

I've seen those too. I don't care whether or not they have a filter (my water bottle does), but I do like that it just makes it way more convenient to top off the water bottle. Before, I had to tilt the bottle and that would mean I couldn't fill it all the way.