Going long? Camelbak's Marathoner Run Vest carries what you need. It only weighs 12.7 ounces and has enough room to store a jacket and other essentials. In front, wide, adjustable shoulder straps help the Marathoner fit snugly so it stays in place. These straps also boast easily-accessible pockets so you can grab food on the fly. And, CamelBak's awesome 70-oz Antidote reservoir is included for hands-free hydration.