Customers most agreed on the following attributes:
I am a camp counselor during the summer, and I fill my unbottle up every morning with ice water, and it stays cold throughout the 100+ degree day.
I really like it. Mouth piece should be made of harder material. I am chewing mine up and will have to replace it...in time.
Great for the price, helped keep my water cool in the heat and warm out in the snow. fits great in my osprey.
I'm a big dude, 230lbs and 6'4" so I tend to suck down a lot of water on a hike. The bag is nice and you can attach it to just about anything even the outside if you wish, just don't bushwhack that way.
bought 2 ,one for the girlfriend and my only 2 issues were minor, no tube insulation and no mouthpiece dirt guard. Both can be fixed with a little craftyness.