I’ve had about ten different water bottles, and they’ve all had massive flaws. Here’s my opinion about the best bottle out there now.
The Opening
The opening of a water bottle should be small, no more than the size of a quarter. Large lipped bottles make it harder to drink, and usually result in water spilling on you.
Nalgene realized this and implemented a crappy solution involving a plastic piece to place on top. I prefer the simpler solution: a small opening – like a regular SmartWater bottle.

The Lid
The lid has to protect the mouth of the bottle. Tossed in a bag, sediments have a tendency to cover the place where your mouth touches.

Sigg doesn’t properly cover the lid, and neither do most of Kleen Kanteens. I did find one Kleen Kanteen with a wide mouth, but the bottle sweats and is quite large:


Sweating
Sweating wasn’t one of my main concerns until I bought a...