Nathan Unisex's Firestorm Hydration Vest/Pack Black, One Size

Bounce Free - Adjustable chest strap for perfect placement and bounce free ride 2L Bladder - 2L bladder with quick release valve and organizer pocket with key ring clip inside upper back pocket Easy storage - Helmet loops at upper side back of vest and a rear external shock cord for increased capacity Reflective - Highly breathable wall mesh shoulder straps with reflective trims and a rear strobe clip Cyclist & Runner - A versatile, lightweight solution for both the runner and cyclist to carry water on the back