This small (2.8L capacity) shoulder bag minimizes shaking during activities, whether used alone or with a backpack. When used alone, the clip-type strap inside the back slit is attached to the tape of the shoulder pad, and when used with a backpack, it is attached to the shoulder tape of the backpack to improve the fit to the body. The wide opening allows for smooth storage, and the inside of the main body is equipped with a key clip and mesh pocket. The main fabric is made of "AZTEC ECO canvas", which is durable and water-resistant. The shoulder bag reduces separation from the body or sudden rotation even when leaning forward, allowing for active activities in the field.