The NEW standard in extreme function, accessibility, and ergonomics.The X offers aspiring trail runners & elites the most intelligent storage, function and versatility available. Discover phenomenal stability & comfort in any situation. – Volume: 10L– Weight: 297g – One Size– Ergo Quiver Compatible Its unique design follows one of Instinct’s main goals; to access with the greatest ease, all essentials without ever removing your vest while running.High sitting, the X offers remarkable comfort, stability, and liberty of movement.Whether it be water bladder, bottles, or soft flasks, the choice is yours.Optimal positioning of pockets & adjustments allows for natural, effortless & intuitive access.Its shoulder straps offer unique storage for all/any possible feed, hydration, and storage desired. Securely and immediately store your smartphone in one of two extra-large zipped pockets. Lightweight & breathable honeycomb mesh ensures ventilation and sweat dissipation without sacrificing strength or reliability.Adjustable front sternum straps and our unique refined side elastic lacing system allow for a custom fit to almost any body type. Discover stability, liberty of movement and unconstrained breathing. FRONT– 2 x 650ml hydration pockets + elastic compression cords with auto lock. High sitting for immediate & effortless access.– 2 x 600ml feed storage pockets.– 2 XL zippered pockets for easy access storage of smartphone or important objects.– 1 x 150ml zipped shoulder pocket + non-stretch internal cord ring + whistle. For safety essentials and more … BACK– 1 x 800ml top horizontal pocket + elastic compression cord with auto lock. Easily access your rain gear right from the first drop without removing bag!– 2 x bottom horizontal pockets. Central access to safety kit, headlamp(s), gloves, arm warmers …. and more– 1 x side access pocket for quick storage of gloves, rain pants, headlamp or rain vest.– 1 vertical top access pocket with closing buckle + velcro strap. 2L water bladder compatible.– 1 main 4 liter “U-shaped” zippered pocket compartiment for large & quick storage in any situation. POLE SOLUTIONS and more– 3 carrying options. Front : vertically right & left // Back : horizontally or vertically. ADJUSTMENTS & FIT– 2 adjustable chest straps mounted on 20 cm sliders = custom fit vertically and horizontally.– 2 double “S” elastic cross-lacing with auto lock: “on the fly” side adjustment!– 3 elastic compression cords with auto lock for top and bottom back pockets.