Run with a good wallet, because your arms need to swing when running. If you use a bad arm bag, just wait for the skin on your chest to wear out, and you will sweat when running, and your arms will sweat. After sweating, the armband is easy to slip off, and it will be a lot of trouble to lift the armband when running! If you use a wallet, you won't have the above problems, but you must consider the weight of the wallet when choosing a wallet. Try to choose a professional running wallet. Goout wallets are very good, some with multiple pockets are very light and of good quality.