Since I have children - and there are now many as nine years old - I'm looking for a real tight and leak-proof water bottle. And now at last I have found it! The Nalgene bottle holds tight, not running out, easy to clean by hand, but tolerates as well the dishwasher. In addition, it has a scale, which I mix the apple spritzer find very convenient. And on top of all it is still significantly cheaper than all the SIGG bottles that we have worn out over time ... and they do not even get bumps, it flakes off no paint and free of harmful substances, they should be yet. What more do you want ?!