Salomon's motion-mirroring SensiFit design is the key to the pack's excellent fit and "race" performance. Completely supported by your upper body, the pack employs bungee-like connection points across the chest that can be adjusted from a single point to micro-adjust fit and pull the pack closer to your frame. The soft fabrics and frameless design assure a chafe-free carry and leave your diaphragm able to expand freely so your breathing remains uninhibited. Extensive, wide-open mesh on the backpanel and broad harness straps helps to cushion the pack against your body while maximizing airflow to keep you cool. To ensure that you stay properly hydrated, two included 500 ml soft flasks nestle conveniently in front harness Sensifit 1 back main compartment with silicone grip 1 front expandable pocket 1 front zipped pocket 2 front stretch pockets 2 front flask pockets with secure loops 1 low back pocket with 2 side access 2 front zipped stretch pocket YKK zippers Integrated whistle