I ordered the camelbak from Prolithic, and after a round of excellent service, I received this excellent "bottle".

The Zoid is insulated for winter use, and I have used mine both over and underneath a jacket in most types of weather conditions. (It also functioned very well with icecubes in it on hot days in Greece (above 100 degrees F)). The insulation keeps water cold when it's hot as well as cold when it's hot.

Easy to take out the rubber bladder from the "backpack" to use in other packs for hiking etc.

Excellent for randonnè skiing, something I experienced while snowshoeing a really steep mountainside with the snowboard on my back. My companion bought the same type Zoid the next week.

Only complaint you might have is the slightly rubbery taste the water acquires after more than two hours in the bladder, something which to me isn't all that important.(Although my girlfriend winced a bit a few times in Greece, although she didn't dehydrate like others did :)

And if you're touchy about looks, be sure to wear it over the jacket as to not look like a hunchback:)

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