User Review: Klean Kanteen 27oz Classic
-Doesn't make water taste funny
-Should last a long time
-Heavy (not something to take hiking IMHO)
-Cap can be hard to remove if it's on tight
-Dents if dropped on a hard surface
Overall I like this bottle for taking to school/work/general everyday use--no concern of chemicals leaching into the water and no funky flavors if the water is in the bottle for a day or two.
I would not use it on a hiking trip as my Nalgene HDPE bottles are much lighter and will hold up better if they happen to get dropped down a talus slope like I once did with a Nalgene Lexan bottle on Mt. Jefferson in NH. The Klean Kanteen already has a dent at the bottom from being dropped on the pool deck while filled with water, so I'm sure bouncing off rocks would bang it up pretty well.
The weight and the fact that it dents fairly easily if dropped on a hard surface are the reasons I only gave it 4 stars.