It isn’t simply the burden of your % — it is the way you raise it. The Spire helps to keep the burden (and the sweat) off your back way to a lumbar reservoir and suspended mesh back panels. The reservoir retail outlets your hydration close to your hips for larger steadiness at the path, and the mesh NV panels stay your back cool and ventilated regardless of how rugged the climb. The Spire could also be engineered to suit girls ergonomically, with an S-curved harness that helps to keep the % nearer in your frame, and a sternum strap that sits comfortably throughout your chest. That approach, you’ll be able to put out of your mind about your load and concentrate on the path in advance.