FreeFloat ultralight suspension with flex panels that move with the natural movements of your body Ventilated mesh back panel with Polygiene Stays Fresh Technology, designed to help maintain freshness and enhance comfort. ComfortCradle hipbelt with 3D construction for hotspot free, body-hugging comfort Oversized zippered hipbelt pockets with enough space to fit cell phones and trail essentials Ultralight, perimeter aluminum frame and fiberglass anti-barreling cross-stay for superior lightweight load capacity Comfort wrap, breathable shoulder harness with sternum strap featuring integrated safety whistle and hydration clip Gregory Facet 45L & 55L Women's Ultralight Backpacking Pack with Freefloat Suspension, Aluminum Frame, Ventilated Backpanel