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When we're striding out for double-digit miles, we kit up with the Nathan VaporAiress 3. 0 7L Hydration Pack. The low-friction, performance material wicks away sweat and dries off quick to keep us cool, light, and chafe-free, while the adjustable straps let us dial in a perfect, bounce-free fit. Equipped with seven pockets and a two-liter bladder, this vest keeps us stashed with all the fuel, layers, and water we need for our long trail runs.