The biostretch technology means it creates a figure hugging fit by completely connecting your body and pack whilst moving this lessens pack roll and results in reduced levels of fatigue the pack also has an integrated digiflip pocket on the harness made from tpu film this allows you to check your gps or operate your phone on the run without having to remove the device from the safety of the pack dual sternum straps ensure that the pack sits perfectly and provide optimum placement for the m