Fits You Perfectly: Ergonomic design, adjustable shoulder and chest straps, offer a range of adjustments for a personalized and comfortable fit and increased stability. ideal for adults and children. Chest straps keep you from bouncing when you move. Hydration bag is also a good cycling partner.Breathable and Comfortable: Made of ultra-light nylon resistant to water and tears. Mesh and porous EVA design on the back and shoulder straps with ventilation channel. Multidirectional airflow and padding to maximize comfort and breathability, making it the ideal hydration backpack for running.Hydration Bag with Water Pocket: Compatible with 2L drinking bubbles, BPA free, designed according to health and food standards. The extra large screw cap makes it easy to fill the hydration bladder with water. Detachable hose makes cleaning easy - just rinse, drain and invert.Perfect outdoor gear: The trail bag has several storage compartments that give you all the space you need to store your various necessities. Reflective accents for good visibility in dark environments. The running backpack includes a thermally insulated pouch that will keep your drink hot or cold for hours. The running water bag is an excellent companion designed for versatile activities.