FreeFloat A3 suspension system with dynamic flex panels and auto rotating shoulder straps that move with the natural movements of your body AirCushion foamless back panel promotes airflow, helps reduce pressure points, and supports moisture-wicking for enhanced cooling. 3D shoulder harness and hipbelt construction eliminates wrinkling and hot spots to provide hotspot free, body-hugging comfort All suspension components treated with Polygiene Stays Fresh Technology, helping to reduce odor buildup and enhance long-lasting freshness Auto-rotating, dual-density shoulder harness with sternum strap featuring integrated safety whistle and hydration clip ComfortGrip lumbar pad helps prevent pack slip and keeps the pack positioned high on your hips without the need to over-tighten the hipbelt