Zygos 5.0 Hydration Pack

Built for long efforts where you need to carry real gear without slowing down, the Zygos 5.0 is our top pick for serious trail runners and mountain athletes. ErgoFit construction distributes weight precisely so the pack moves with your body, while the MaxO2 sternum system lets you breathe and stride without restriction. Eight on-the-go pockets keep nutrition and gear accessible without breaking stride.

• ErgoFit harness conforms to your torso and distributes load across your body — no dead weight, no bounce, no chafe on long efforts
• MaxO2 sternum uses shock cord with full rebound to keep the pack snug against you whether it's loaded or empty, without compressing your chest
• Insulated Mylar bladder compartment fits the included 2L reservoir and keeps your fluids cold even on hot Southern summer runs
• Eight on-the-go pockets including two zippered shoulder pockets, dual stretch mesh, a phone-ready zippered pocket, and magnetic side closure — everything reachable without stopping
• UltrAcool light mesh back panel promotes airflow against your back, making it more tolerable in high heat and humidity than a standard foam-backed pack