Features 1、Waterproof fabric, seamless technology, protects the items inside the bag from rainwater intrusion. 2、Easy and quick to install and remove. 3、With reflective pattern for safety night Cycle. 4、The tail light belt design allows for hung bicycle tail light. 5、With a 4L capacity, it provides ample storage space for your items such as keys, mobilephone, wallet, etc. This bicycle bag is an perfect choice for cyclists, easily installable on the rearseat or seatpost of your bike. With a 4L capacity, it provides ample storage space for your items such as keys, mobilephone, wallet, etc. Moreover, its waterproof design effectively prevents rainwater intrusion, ensuring the safety of your belongings. Whether you're commuting in the city or adventuring outdoors, this sturdy bike tail bag, with its practical design, meets your daily Cycle storage needs perfectly. Features: Waterproof fabric, seamless technology, protects the items inside the bag from rainwater intrusion. Easy and quick to install and remove. With reflective pattern for safety night Cycle. The tail light belt design allows for hung bicycle tail light. With a 4L capacity, it provides ample storage space for your items such as keys, mobilephone, wallet, etc. Specifications: Main color: black Main material: polyester Capacity: 4L Item size: 360 * 100 * 120mm / 14.2 * 3.9 * 4.7in Item weight: 395g / 13.9ounce Package size: 450 * 260 * 90mm / 17.7 * 10.2 * 3.5in Package weight: 410g / 0.9lb Packing List: 1 * Bike Bag Package List 1 * Bike Bag