Bought for school for my son. Nalgene is with us in use in my water bottles. I have been following the election of my products purchased rather by good quality and for spending a little more money, Here I was sadly disappointed as this bottle dripping. So I can not use because it must be transported in the satchel. Now I'm skeptical when buying other Nalgene products. Very unfortunate. Then the next time with a screw cap ... that they seem to be able to well again!