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A 'hydration pack' is a type of hydration system built as a backpack or waistpack containing a 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. Reservoir sizes commonly range from 1.5 to 3.0 litres.
Hydration packs are commonly used for outdoor recreational activities, such as hiking, bicycling, and kayaking, as well as for military maneuvers.
Companies that manufacture hydration packs include:

★ Berghaus

★ CamelBak

★ Dakine

★ Deuter

★ Gelert

★ GoLite

★ Gerber

★ High Sierra

★ Hydrapak Hydration Packs

★ Hydrastorm Hydration Systems

★ MPACK Endurance Gear

★ MSR

★ The North Face

★ Oasis Hydration

★ Platypus

★ Source Vagabond

★ Ultimate Direction

★ Wingnut