Be careful about droping the Vivi. If it gets dropped to many times, you will bend the center post inside the Vivi. Then, your mouthpiece won't line up with the post and you will get lots of liquid in your mouth, more so if you tip it upside down. I dropped my Vivi so many times, the piece between the bottom
thread of the
tank and the
thread that goes into the battery separated and now I can't fit it back together.