SOURCE Product Reviews (Page 4)
But the fact that it is not transparent doesn't allow to visualize the absence of bacteria inside the tube...
Overall I would thoroughly recommend the product, this is not a long term usage review but don't see any reason why it would not provide good long term service.
My only complaint is not having an option between the bite and storm valves as I much prefer the latter. This product is worth every penny, and frankly the customer service makes it even more so.
All in all a high quality bottle!
Will buy more in the future