Hydration pack

The reservoir contains a capped mouth for filling with liquid and a hose that allows the wearer to drink hands-free.

Some packs are extremely small and minimalist, designed to add as little weight as possible and remain secure while running or cycling, while others are more suited for backpacking and extended hikes, equipped with much larger bladders.

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.

Additionally, there are acid- and chemical-resistant versions made for military and police use, such as the ''Camelbak Chem-Bio''.

Hydration backpack
Iraqi soldier with " CamelBak " hydration system
CBRN Version: Camelbak Chem-Bio Hydration Reservoir System, Standard Bite Valve, Type M (MSA), Type A (Avon), and Type S (Scott) Gas Mask Drinking Tube Adapters.
Type A (Avon), Type M (MSA), Tube to QDC, Bite Valve.