Hydration Backpack Osprey DYNA 1.5 Flask was born to run !! Ideal for those who want to put themselves on the trail or on any adventure, as they are small, light, has an excellent fit on the body and was designed for ultra-distance and mountain running, where both the terrain and the weather are generally unpredictable. So you only worry about running! The DYNA 1.5 is a small capacity running backpack designed for athletes to support the distance they need, with space to carry water, supplements and little equipment. The backpack is built with a vest-style fit, allowing for comfortable transport and fitting tightly to the body, avoiding swaying during the run. The back and handles are made of DrySystem foam, which absorbs sweat well and helps with evaporation, keeping the user dry for longer. Multiple elastic meshes and zippered pockets on the front of the vest allow easy access, on the go, to nutrition and equipment. The front vest bags contain two 250ml soft bottles with extension hoses, which can be swapped in and out. The compression straps ensure that it has a perfect fit, while the stretched mesh pocket easily stores a waterproof jacket or hat and gloves. The back of each shoulder has a Stow-on-the-Go ™ loop, which can comfortably and efficiently carry running poles on trails, keeping them hands-free. The adjustment straps on the chest are removable and adjustable, with a single release of the hand, in addition to being elastic so that they do not inhibit deep breathing or energetic movements.