The bottle can be opened with one hand, to close, however, I need both hands and a bit of pressure.
It is very pleasant to drink from the bottle, because the drinking spout is tapered.
The design I find strange, but not ugly.
I have tried several bottles: empty bottles of mineral water (2nd best solution), aluminum bottles, Camelback with straw. After I lost my first Nalgene bottle in the train, I bought a new one. I'll stay with this system.