This multifunctional arm bag is specially designed for outdoor sports, fitness, cycling, running and daily casual use. It fits comfortably on the arm, lightweight and breathable without feeling tight. The bag has reasonable storage space, can safely hold mobile phones, keys, bank cards and other small essentials. Adjustable design fits most arm sizes, wear-resistant and durable material for long time use. Suitable for men and women, perfect for running, cycling, hiking, gym fitness and daily outdoor activities.