For trekkers looking for a comfortable pack with good load transfer and maximum ventilation for longer trips. Thanks to the VariSlide system for custom back length fit to any size. Mobile VariFlex ECL hip fins and ActiveFit shoulder straps wrap around the body. This means that even heavy loads can be carried in comfort, with the load moving in unison with the body, thereby saving energy. The eronomic Aircomfort Sensic mesh back system keeps air flowing across the back for superior ventilation.