Multi-Functional Can be used messenger bag / shoulder bag / cross body backpack / casual day pack / sling bag / chest bag / travel bag / working or business bag, suitable for office, school, outdoor, business and other occasions. Minimalist and simple design. Available in 3 colors, choose your favorite! Stylish, Unisex and Effective. External USB charging interface You can charge your mobile phone, just put a power bank in your backpack Password lock that can be set The default password is "0-0-0", you can also change the password yourself Adjustable Chest Buckle By hooking the connection, easy to disassemble, free to switch, both shoulders Small Size And Large Capacity The sling bag is not a full size backpack. It is suitable for carrying your cellphones, keys, wallets, water bottles, umbrellas, and some thin clothes. The back of the man bag has a concealed pocket to safeguard the safety of important items.