The bike rack bag for back of bike is made with water-resistance 500D PVC material which protects your belongings from being wet on rainy days. The bike bags for bicycles rear rack can be also used as a shoulder bag. Perfect for a variety of scenes and make your trip more convenient. Its capacity is large enough to meet the needs of general long-distance cycling. The bike trunk bag can store clothes, shoes, camera, notebook, food, etc. The bag is equipped with one large packing compartment, and small pocket for storing small items. The sides have a reflective spot design, providing better visibility at night .