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Whether we're trail running, climbing, or just out for a brisk stroll in the mountains, the Mammut Lithium 15L Backpack helps us shift into a higher gear with a speedier, lighter weight design. The well-ventilated back panel keeps us cool and comfortable while we're trail running, and the integrated, detachable raincover protects our gear in a pinch under passing rainstorms. A zippered main compartment and large front pocket accommodate everything we need for an afternoon at the crag, while side compression straps and a hydration compatible design help us adapt on long, roaming day hikes.