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, excellent comfort and a snug, secure fit on multi-day via ferrata (fixed-rope) routes.  The flat-format lid allows space for the head to move, even with a helmet on. Loops on the shoulder straps keep via ferrata set carabiners close at hand. While equipment and gear are easy to access via a large front zipper opening or in the side pockets.