The Epic is Mountainsmith's signature piece in their newest technical lumbar collection. The running or fast-hiking design is the most comfortable, stable, and functional lumbar pack to ever see the trail. A one-liter, roll-top reservoir with the unique anti-slosh feature makes carrying that much water quiet and stable. Their air flow back suspension system keeps the load comfortably away from your lower back, promoting excellent ventilation. Lots of room for Gel, Jackets, Music, and other essentials.