Hydration Pack is a type of hydration system. It is built as a backpack or waistpack containing a reservoir or bladder made of rubber or flexible plastic.
Hydration packs are commonly used for outdoor recreational activities, such as hiking, bicycling, and kayaking, as well as for military maneuvers. Most field backpacks designed for backcountry or military use include accommodations for a user-supplied hydration bladder.
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