Kor bottles feature an innovative cap and seal that is completely leak-proof when fully closed. If you think your bottle might be leaking, please check these potential causes: The water may be coming from residual water that is trapped outside the spout and but within the cap before closing. It is possible that residual water has been trapped within the side trims of the Kor bottle when washing or refilling.  Make sure that you have closed the lid properly and it has clicked into place.  If the bottle lid is not fully closed, water may leak out.