Dual Form with Variable Backpack: This multifunctional bicycle shelf bag easily converts into a backpack using built-in shoulder straps. The zipper allows for quick transformation, making it versatile for both cycling and carrying.

Large Capacity & Adjustable Storage: The bag offers up to 18L of space, perfect for storing cycling gear. The roll opening design allows you to adjust the capacity based on your storage needs.

Waterproof Design: Made with a seamless compression process, the outer layer is welded, and the inner layer is fully glued, ensuring no water seepage, even during long-distance rides in the rain.

Quick Installation: Compatible with a variety of bike racks, the adjustable buckle system allows for easy and secure installation. It fits racks with a minimum spacing of 10cm and a maximum of 20cm.

Additional Functional Features: Includes a helmet fixing buckle on the side for extra storage, reflective logos for visibility, and side hooks for attaching taillights. The chest buckle can also double as a whistle for added safety.