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How much water you should drink depends on three main factors: climate, your level of exertion and your own individual needs. 1  Climate: When hiking in hot and/or humid conditions, one litre per hour is generally recommended. Climate: When hiking in hot and/or humid conditions, one litre per hour is generally recommended. 2  Same goes for altitude, where although the temperature may be cooler, the air is drier and thinner. 3  In milder conditions at lower altitudes, half of the above mentioned quantity should normally suffice.
The sweet spot for most hiking and multisport daypacks is 30 liters (around 1,830 cubic inches). That's enough capacity to hold the Ten Essentials (for the list, see the REI Expert Advice article, the Ten Essentials) plus some extras. Sizes vary by intended use.