The Duro LT trail running backpack from Osprey has been designed for runners seeking autonomy without compromising on lightness. The Duro LT offers a practical solution with its flask pockets while the vertical zip pocket secures your personal belongings. With details like an adjustable chest strap and an integrated safety whistle, the Duro LT guarantees comfort and safety with every stride. Two extra-large stretch mesh pockets on the shoulder straps for soft flask/food Two lower stretch mesh pockets on the shoulder straps for food/supplements Vertical zip pocket for personal items or phone Double adjustable/removable chest strap for customized stability Retractable safety whistle Large rear stretch mesh pocket with dual entry Main material: 100% nylon stretch mesh Weight: size S (240 g), size M (270 g), size L (290 g) Volume for all three sizes: 0.5 liters Osprey Duro LT - Trail running backpack - Men's | Hardloop