This innovative, patent-pending design of the TF Base Harness by TrailFlex provides a torso-hugging foundation on which sports enthusiasts can attach a wide variety of gear - from binocular cases to cell phone pouches - with comfort, convenience and easy access. The TrailFlex™ Base Harness, which comes in two sizes to ensure proper fit, includes an integrated hydration system. • Patent pending contour neck and shoulder fitting system • Hydration tube slots located on both sides • Sternum strap and hydration tube clip can be positioned at multiple positions using AMT Technology • Cool mesh lining for comfort • Multiple AMT attachment points (on both sides) • Four layer padded lumbar support area • Strap channel secures and conceals adjustment strap ends Back: • Integrated hydration pouch • Dual side hydration tube slots • Torso adjustment system • Lumbar adjustment straps • Integrated one-liter hydration reservoir with Microban® antimicrobial protection included Weight: Med Torso: 1.8 lbs. Long Torso: 2.2 lbs. *The TF Base Harness comes in two torso lengths. Ensure you get the proper length for optimum fit and comfort by referring to “Finding the Right Fit” in the System Guide.