After more than 5 years Rennradfahren I needed some new bottles. Respect due to some negative comments. I smell slightly hesitated to order this bottle. In retrospect, it annoys me that people adjust so irritating and exaggerated pseudo-reviews and talk down a good product without rhyme or reason. The "acrid stench" is a common smell, which had disappeared after an hour filled with water forever. Much more important: The bottles are sturdy, can be fixed, you can always see the level. Round, a very good bottle for a hard beatable price. I can only recommend - I have previously had only inferior bottles.