- Waterproof Material & Insulated Lining: Constructed with durable, water-resistant fabric, this bike rear rack bag includes protective padding to cushion your belongings against road shocks. The insulated lining effectively maintains the temperature of your food and beverages, keeping them cold or warm for hours. - Large Capacity (8L): Measuring 14.9 x 6.3 x 6.2 inches, this bike trunk bag features a spacious main compartment, a top pouch, a side pocket, and an inner mesh pocket, ensuring that your essentials are organized and easily accessible. Perfect for long-distance rides, it provides ample storage for all your needs. - Easy Tool-Free Installation: Designed with 2 adjustable Velcro straps and 2 fixed buckles, this bag offers stability and can be installed or removed in seconds without the need for tools. It is compatible with most road and mountain bike racks. - Safety Features: Equipped with two side reflective logos, an all-around reflective pipeline, and a back reflective strip with a taillight loop (taillight not included), this rear seat bag enhances your visibility during nighttime rides, ensuring a safer experience. Use Scenarios: - Ideal for commuting: Pack your laptop, lunch, and a water bottle for your daily rides to work or school. - Great for weekend adventures: Store snacks, a first aid kit, and hydration for long bike trips or picnics. - Perfect for shopping: Easily carry groceries or other essentials without the hassle of heavy bags.