Hydration pack

<h2 id="history">History</h2>
<h2 id="uses">Uses</h2>
<p>The volume of the reservoir and the pack carrying it can vary widely depending on the purpose of the hydration pack. 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.  However, as water weighs 1 kilogram per litre (8.3 lb/US gal), it is impractical to carry more than a few liters in most situations; typical reservoirs are between 1–3 L (0.22–0.66 imp gal; 0.26–0.79 US gal), even for very large backpacks.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a>
</p><p>Besides hydration, water reservoirs may be used for washing dishes or equipment, or for showering.  Pressurized hydration bladders are used in some cases to provide a stream powerful enough to effectively wash with, or the bladder may be suspended from a high place such as a tree branch to employ gravity in generating water pressure.
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<p>Hydration packs are commonly used for outdoor recreational activities, such as <a href="/facts/Hiking/agJbxevo">hiking</a>, <a href="/facts/Bicycling/XH6EKjAF">bicycling</a>, and <a href="/facts/Kayaking/L6vjN0Lp">kayaking</a>, as well as for military maneuvers.  Most field backpacks designed for backcountry or military use include accommodations for a user-supplied hydration bladder.
</p><p>Due to hydration packs being airtight, they are widely used in CBRN protective situations with full face respirators allowing full mobility and fluid/nutrients supply—unlike canteens which must be held upside down. Additionally, there are acid- and chemical-resistant versions made for military and police use, such as the ''Camelbak Chem-Bio''.
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<h2 id="gallery">Gallery</h2>

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/CamelBak/eGEYkMLj">CamelBak</a></li>
<li>Hydrapak</li>
<li><a href="/facts/Source_Vagabond_Systems/w5LeaXyG">Source Vagabond Systems</a></li>
<li><a href="/facts/Hydrational_fluid/MP7ecgrJ">Hydrational fluids</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1"><p>King, Amber (August 13, 2016). "How to Buy a Hydration Bladder". outdoorgearlab.com. OutdoorGearLab LLC. Retrieved April 5, 2017. <a href="https://www.outdoorgearlab.com/Hydration-Bladder-Reviews/Buying-Advice" target="_blank">https://www.outdoorgearlab.com/Hydration-Bladder-Reviews/Buying-Advice</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li>
</ol>

Hydration pack open-in-new

Hydration pack