Designed specifically to fit the female form men see the hpl 020 for men39s specific version 6l of total storage capacity including 2l bladder patented 3 way propulsion harness controls bouncing and swaying for runners repositioned bladder tube now exits from top of pack to eliminate skin contact front power stretch mesh pockets and two rear zippered compartments store all of your essentials wall mesh shoulder straps and back panel channel air across your skin and wick moisture away