Waterproof structure: Hard shell construction with a sealed zipper prevents rain and water intrusion, protecting internal contents from moisture in challenging environments. Adaptable carrying designs: Adjustable shoulder straps and hand rings enable multiple carrying styles, including handheld or singleshoulder use. Lowlight riding protection: Embedded brightness reflective strips enhance visibility during nighttime or dimly lit rides, contributing to safer cycling in challenging lighting conditions. Practical and organized: Main compartment accommodates water cups, tools, and clothing for organized storage, while the front interlayer holds keys and cards. The 8.6L threedimensional design delivers maximum utility and convenience. Use scenarios Daily commuting and urban rides: The waterproof shell protects items in rain, while multiple carrying options simplify handling during trips to work or errands. Weekend rides or longer trips: The 8.6L capacity and organized layout support packing water cups, tools, and clothing, with a dedicated space for keys and cards for quick access. Night or earlymorning cycling: Reflective strips boost visibility, helping drivers and pedestrians notice you in lowlight conditions.