• 【EVA Hard Shell Protection】The one-piece EVA shell maintains its shape and helps protect phones, wallets, and other valuables from pressure and impact.
• 【Expandable Large Capacity】The bag provides 17L capacity before expansion and expands to 30L for cycling gear, rainwear, or daily belongings.
• 【Reflective Night Visibility】Reflective strips and a reflective logo on the rear and sides provide noticeable warnings during nighttime cycling.
• 【Organized Storage Design】A top bungee net, side elastic bottle pocket, and wide double-zipper opening support convenient storage and access.
• 【Detachable Shoulder Strap】The detachable shoulder strap allows the bag to be carried as a shoulder bag after removal from the bicycle.

Specifications:

• Material: EVA + Polyester
• Capacity: 17L before expansion; 30L after expansion
• Installation Method: Magic Tape Fastener
• Waterproof Rating: Waterproof