Enhanced dry storage: A robust hard shell and precision sealed zipper block water penetration, keeping belongings dry and secure even in rain, splashes, or wet roads. Convenient handling choices: Adjustable shoulder straps and hand rings offer flexible carrying options such as hand-held or single-shoulder use, making this rear bike rack bag adaptable to varying riding and commuting needs. Low-light riding protection: Embedded high-brightness reflective strips boost visibility during nighttime or dimly lit rides, supporting safer riding in challenging lighting conditions. Practical organization and capacity: 8.6L three-dimensional layout keeps gear organized. The main section accommodates water cups, tools, and apparel, while the front interlayer provides a secure place for keys and cards. Design and compatibility: Specifically built for rear bike racks with durable construction and a reliable closure system to withstand daily use, providing dependable storage for cycling trips. Use scenarios: - Daily urban commute in wet weather: keeps electronics and clothes dry and accessible. - Weekend rides or longer trips: organized space for tools, cups, and apparel, with quick access to essentials. - City errands or night rides: enhanced visibility from reflective strips and convenient access to keys and cards.