These stable trekking packs have also undergone a complete transformation. With luxurious back padding and top-notch features, these packs are nice load haulers, burly provision keepers, and organized gear storage all in one package. The pivoting Vari Flex fins hold the load firmly in place. Combined with the X-frame and the Vari Quick system they form a carry system that will take medium to heavy loads, while maintaining stability, flexibility and optimum load transfer. With its new back-padding layout, the Aircontact System sits even more comfortably on the back, while at the same time optimizing the airflow.