Function: ✔ MATERIAL: The bag is made of and tear-resistant fabrics with high density, which are and scratch-resistant, will curl. ✔ ERGONOMIC DESIGN: Extended shoulder strap in the bag to reduce the shoulder pressure caused by carrying the backpack black for a long. The shoulder strap of the sling bag with many pockets can be adjusted to a suitable length and can be fastened stably in the correct position, even when you run. ✔MULTI STORAGE AREA: main bag with large capacity, pocket with zipper on the front, pencil pocket on the inside, makes it easier and safer to store small items. Large capacity can meet your storage needs. ✔ USB CHARGING PORT: External USB charging port, it is convenient to charge the phone to your hands outside (the bag does include a battery). ✔MULTI-FUNCTIONAL: With a detachable buckle, you can between a shoulder bag and a backpack ， Stylish, unisex and efficient. Suitable for office, school, outdoors, business and other . Specification: Fabric: nylon fabric Weight: about 0.20 kg Type: Shoulder bag / (left and right) chest / backpack / bag Function: Color: Khaki, dark blue, black, gray, green Size: width 15 * height 25 * thickness 5cm