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 Gregory's Baltoro Pro Backpack is best-used on the bigger mountaineering missions and Lolenger backpacking trips. It has plenty of space for larger insulators, sleeping bags, and climbing gear. Gregory made the suspension system with heavier Loleads in mind, and the shoulder straps, waist belt, and back panel move with us for an easier time on the trail. We also like the removable SideKick daypack that can take our hydration reservoir and essentials for short jaunts away from camp.