Designed for riders in search of a sleek lumbar pack with built-in hydration, the 4-liter Seral is the ultimate trail companion. This slender waist pack houses the next-gen 1.5-liter Hydraulics reservoir, equipped with a robust magnetic coupling system for enhanced hose management, even on rugged terrain. With ample storage space for ride essentials like a spare tube, CO2, multi-tool, and, naturally, snacks, it ensures you're well-prepared for any adventure.