Chest Bag Features:Anti-theft Chest Bag: This Chest Bag apply anti-theft design techology .Zipper of main pocket is fully in the back of this bag thereby providing security for your items.NEW FUNCTION: External USB with built-in charging cable offers a convenient charging of your electronic device anywhere, and this bag do not include a battery, you need a power bank to charge it.Night safety shoulder bag: There is a Reflective Stripe on the front of the bag which makes this backpack more conspicuous in the night. When you are riding or walking at night, the luminous strip will make people see you within 50 meters, so as to avoid a car accident .Backpack with adjustable shoulder strap, well padded, makes the chest bag comfortable to wear.