The rev 18 features a biostretch body wrap harness and body belt these combine to create 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 stretch mesh harness pockets provide easy access