The bottle was in daily use, and always kept tight. After nearly two years of closure lies no longer close properly - mechanically worn. This is evident when going and so I was able to avoid a pack leaking bottle. After leave the lid but simply reorder I think that is an acceptable wear. Other bottles (eg aluminum) hold in the utilization longer not. The Nalgene has the added advantage that it can be very easy to clean. Otherwise, the bottle is robust, the colors are shown and the operation is very easy.
