"PERFECT FIT: This running vest is ergonomically designed and contoured to fit the body perfectly. Adjustable waist and chest straps can adjust the size to your body shape, preventing annoying bounces and shakes while running.SUPER COMFORTABLE: Stretch mesh fabric brings cool comfort to your back, and the lightweight and soft shoulder straps will not rub your skin at all.ULTRA LIGHT DESIGN High-quality nylon material and ultra-light design, more convenient for exercise The sports backpack weighs only 190g, 30cm (H) x 5 (W) x 20 (L) cm, the main compartment can hold 3 liters, there are pockets for 250ml PET bottles on the left and right shoulders, and there is a pocket for mobile phones and items, you can listen to music while jogging.HIGH-QUALITY HYDRATION BASKET 1.5L Food-grade water bag is made of non-toxic and odorless PEVA, which can be quickly filled with water and ice, while it is easier to clean the water tube (40 inches long, 0.4 inches in diameter). Provides a healthy water flow, convenient drinking, water temperature. The range is -20 ~ +50 C."