Hydration Pack

A hydration pack or drink bag is a type of hydration system built as a backpack or waistpack containing a reservoir or "bladder" commonly made of rubber or flexible plastic. The reservoir contains a capped mouth for filling with liquid and a hose that allows the wearer to drink hands-free. Most hoses end with a "bite valve" that opens when the user bites down on it; the valve may be protected by a dust cover.

Some hydration packs are insulated to keep water from freezing or becoming warm.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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