The reduced contact surface of the deuter Airstripes back system and airy, quick-drying Air Spacer mesh against the back combined with perforated shoulder straps and hip fins ensure maximum airflow, even weight distribution and a snug, secure fit on via ferrata (fixed-rope) routes. A flat-format lid allows space for the head to move, even when wearing a helmet. Loops on the shoulder straps keep via ferrata set carabiners close at hand. And a large front zipper opening and side pockets mean equipment is always easy to access.