Camelbak Octane LR Hydration Pack Air Mesh back panel, Antidote lumbar reservoir . Ultra-light 3-D Mesh harness with gel pocket and SliderTM Sternum Strap Stash pocket on waist belt for easy access to gel or essentials. Designed to carry extra layers, ultra-light weather protection, trail maps, energy bars, compass, headlamp Front and back reflectivity