"Good to Go" - Review of Katadyn Exstream Purifier Bottle

This product works really well in many cases! Definately approve for the avid hiker. If your a survivalist though your going to run into some drawbacks with weather. I am a survival instructor in Washington and we get roughly 4 to 5 feet of snow in the winters and into the single digit temperature range, this product is not insulated at all and your water will freeze in less than 30 min. To the company; if you could make an insulated model that would withstand cold temperatures that had a larger bite valve (diameter)for larger flow of water, then I might be interested in purchasing this product in large bulk i.e. 200 a year.
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