User Review: SIGG Lifestyle Bottle 1.0 Liter
I had my SIGG for about 6 months and the liner started to wear and flake off around the thread area (Where the cap screws in). I guess it was due to the wear and tear of opening and closing the cap.
Look closely around your thread area and ensure that none of the aluminum is exposed. The lining is yellow. If you see any silver, that’s aluminum. Aluminum, if leached into the water, can cause Alzheimer's disease. I have switched to a Laken bottle and it does not have this problem. See how they solved it at www.laken.es.