Hydration pack

"Water tube" redirects here. For the toy, see Swim ring. For the type of boiler, see Water-tube boiler. For standalone suction devices, see drinking straw.

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.

An alternative product is a lightweight material vest with built in hydration system, generally know as a race or running hydration vest. Used by recreational to professional runners, providing a closer fit, with less likelihood of injury from pressure points - along with front stash pockets, and may include additional storage on the back.

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