Originally Posted by cedricbosch
This weekend I'm going to do a little experiment with them and I'll post my results.
No need. I live in Phoenix and it keeps stuff cooler longer. As posted above I've ridden with one normal bottle and one Polar and the Polar still has ice in while in the other one not only has the ice melted but the liquid has warmed up. All the post here have the right idea.
The Polar bottles carry as much fluid as a normal bottle(24oz), the bottle is just a little bigger.