Product details: Brand: ROCKBROS Name: Bicycle Hard Shell Rear Bag Material: Hard shell part (EVA+PU) Bottom perimeter pocket (Jacquard PU/100% Polyester) Weight: about 877g Capacity: up to 11.6L Color: Black Size: about 40*21*21cm Features: three-dimensional and shaped, large capacity, velcro installation, reflective LOGO, with handle design, etc. Features: 【Innovative design】The bicycle bag has hard shells on both sides of the bag and built-in detachable brackets, so that it is three-dimensional and not sagging. They protect the rear seat bag from external shocks and preserve the contents. The luggage bag has a roll-top closure to adjust the capacity. The soft bottom of the transport bag is designed to fit a variety of frame widths, giving you more choices and options. 【11.6 L Large Capacity & Practical】Size: approx. 40 * 21 * 21 cm. This pannier bag has a capacity of 11.6 L and can hold glasses, pumps, headphones, cell phones, tools, outdoor products, water bottles, food, etc. 【Multifunctional bicycle bag】The bicycle bag has a shoulder strap that can be used as a shoulder bag or as a handbag with a handle. Convenient to carry when traveling, camping, etc. 【Easy & Quick Installation】This bicycle bag has adjustable Velcro fasteners that allow it to be attached to the bicycle frame without additional tools to ensure stability and safety. The adjustable Velcro straps are suitable for most bicycles such as mountain bikes, road bikes, e-bikes, etc. 【Reflective Logo Design】The reflective sign can warn vehicles at night, thereby increasing the warning to make night driving safer.