The Duro 1. 5L Backpack is our choice of storage for sprinting up steep scrambles and dancing meticulously across jagged mountain top spines. One thing we often worry about on long, arduous runs is having the breathability and ventilation required to keep us regulated. Thanks to its almost-perforated Spacermesh 3D fabric, we get just that. The second most noteworthy feature of this distance running vest is its endless storage options: Osprey installed it with a whopping 8 pockets to pack tight all our trail essentials.