Adjusting strap for adjusting tube orifice diameter of flexible tube-shaped object

A flexible tube-shaped object having a dual-layer structure and comprising:

• an inner annular wall,
• an outer annular wall,
• an interlayer being formed between the inner annular wall and the outer annular wall, and
• an adjusting strap for adjusting a tube orifice diameter of the flexible tube-shaped object, the adjusting strap comprising:
• a head portion,
• a tail portion, and
• a flexible rope strap portion having two ends respectively connected to the head portion and the tail portion,
• wherein the tail portion comprises a tail housing having an avoidance hole passing through the tail housing and available for the head portion and the rope strap portion to pass through,
• wherein the head portion passes through the avoidance hole and penetrates the outer annular wall of the flexible tube-shaped object, the rope strap portion is partially received in the interlayer, and the tail portion is completely received in the interlayer and is connected to the flexible tube-shaped object.