This is the ultimate water bottle.
The lid never leaks.
The lid has a strap, and it holds up even if you toss the bottle around while full.
The opening is the perfect size. (With wide-mouth bottles, half of it ends up on your chest.)
It's a tough bottle; it can handle being dropped, so you don't have to be too careful with it. The diameter is just right—you can get a firm grip with one hand.
Maybe if there were a 1.5L version...