Product review (2 stars): ... cap has a thin internal plastic ring that breaks easily rendering the bottle untransportable
The quick cap has a thin internal plastic ring that breaks easily rendering the bottle untransportable. There are replacement caps available but these cost around 2/3 the cost of the bottle. The bottle I had (broken cap) was originally purchased elsewhere for less than the cost of the replacement cap. People seem to have better luck, as in my case, with the flip-cap version which does not have a badly designed closure mechanism as this model does. Best avoided.