Osprey Duro 6L trail vest incl. 2x 500 ml soft flaskThe Duro 6 from Osprey is a high performance running trailing or cycling backpack. Osprey designed this medium sized backpack with attention to detail. It is ideal for athletes to carry the necessary items such as water, food, clothing and useful tools on the road. It is truly a vest that will amaze you from start to finish! The backpack has a fit like a vest, so it fits comfortably around the body and bounce is prevented. The back is made of mesh