Inov-8’s new Race Pro 12 is an “elite lightweight hydration pack” made for trail running, cycling, adventure racing, and other off-trail excursions where speed is goal No. 1. Indeed, this pack weighs less than a pound when empty (15.5 ounces), and includes a minimal feature set: There’s about 12 liters of capacity in the main compartment; a large stretch mesh pocket on back; hip-belt pockets; reflective piping for nighttime visibility; and a nice harness system that hugs when you run. Oh, and did I mention the horizontal hydration bladder. . .