My wife had broken his, who was a handful. It does not have but is equally convenient with this screwing system / unscrewing exclusive and 100% waterproof. I searched everywhere and found nothing better. Big plus the liquid level is visible. Indispensable in the morning to take his tea on the way to work.
Only negative would 45cl model is really big and just returned in height between the cup holder and center console in a VW Polo. I would recommend this model 33cl.
