Packing enough water for a long run is tough in summer heat. That’s why I’ve started using the Salomon Advance Skin 12 Step hydration vest.
This form-fitting pack comes with two 17-oz. soft flasks that ride comfortably in front pockets and has room for a 1.5-liter bladder in an insulated sleeve stored in the back.
A nice addition is the emergency blanket, just in case you take a wrong turn.