Rain protective design This hydration backpack uses Oxford cloth to resist rain and water splashes, helping keep your belongings secure and dry during outdoor pursuits. Flexible adaptability Allows easy transition between single shoulder, dual back, and handheld carrying styles to suit various activities. Includes a front zipper pocket for a mobile phone (fits phones up to 6.1 inches) and additional storage pockets for quick access. Reflective elements add visibility and safety during nighttime runs. Portable comfort Designed for openair adventures, this ultralight knapsack minimizes dorsal tension during long trail runs and maintains a degree of freedom of movement. Breathable comfort The mountaineering vest bag features a breathable mesh design to improve air circulation, keeping your back dry and comfortable and reducing stuffiness during workouts. Use scenarios Urban cycling in light rain: rain resistance helps protect essentials while you ride, with a phone pocket and reflective safety features. Long trail runs in warm weather: ultralight design lowers fatigue and the breathable back panel improves comfort over extended periods. Short mountaineering or outdoor expeditions: versatile carrying options and accessible pockets support quick access to essentials while staying comfortable.