Using nylon cloth material, bag shoulder strap and handle using precision alignment reinforcement, to the bag better bearing capacity. Two-way metal zipper design, modeling simple, durable. Bag selection of high quality ABS accessories, wear-resistant corrosion, shoulder strap and body with a combination of triangle to create a reinforced design, better bearing capacity. Shoulder strap D-type plug buckle design, can carry kettle and other items, adjustable buckle design easy to adjust the length of shoulder strap. Back the use of cellular ventilation network design, long time bear will not be uncomfortable, the use of more humane.