The bottle may leak for more than one reason. Following the guidelines below will help to avoid a leak:
To prevent leaks, check to make sure the plastic screw ring has not been over-tightened on the bottle. The bottle is screwed tight enough when you feel some resistance when assembling the screw ring to the bottle. The design of the bottle neck is such that there should be a gap (see picture below) between the glass bottle body and the plastic screw ring.
If you feel some resistance when assembling the screw ring to the bottle, please stop screwing any further. The bottle is screwed tight enough. Do not over tighten the screw ring. This might lead to damage.
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