The Octane is made from ultra-light materials so it's good for adventure racing, trail running, or XC bike riding – anything where you need to move fast and minimize weight. The Octane XCT takes this approach to extremes by stripping the pack down to the basics. Inside you’ll find a 3 liter Antidote Reservoir, which drops in behind the back panel. On the outside, there's a single vertical zip storage pocket on the front and two stash pockets on the waist belt and harness so you can keep essentials close at hand. For safety, there is reflectivity front and back and a whistle on the harness.