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I asked, because IMO I think you have at least two different needs; something for running, and something for hiking. Frankly, for a three mile run you probably don't need to bring along water. If you hydrate properly (but not overhydrate) beforehand, you shouldn't need to bring water along until you hit at least 30-45 minutes of constant exercise. As for the proper size for a hiking pack, it'd be helpful to know what you're carrying, how long you hike, and any anticipated activities before/during/after the hike.
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