Colors: Blue / Green / Red / Orange 1000 denier construction throughout Dual daisy chains Four compression straps YKK zippers Available with or without convertible top pocket Delrin® rod for support Two external pockets Internal mesh pocket Internal hydration pocket and tube exit port 0.38 inch Delrin® rod gives the Serac and Juggernaut increased stability and enhances load transfer to the hip-belt. 0.06 inch full-length frame-sheet provides support. 0.50 inch foam sheet tailored to contour to the natural shape of your back. 0.38 inch EVA Zote® foam shoulder straps won't crease or wrinkle. 0.04 inch HDPE stays in shoulder straps for increased longevity. 0.13 inch high-density top layer laminated to shoulder straps for increased structural support. 0.04 inch molded HDPE frame within the hip-belt yields perfect load transfer to the hips. 0.50 inch foam pads provide long lasting trail comfort. Medium/3120ci Large/3670ci