Difficulties: Many motorcycles on the market cannot be equipped with side frames, need to carry a number of gears for long-distance riding. The could not find a suitable tail bag, nor could he install a saddle bag or saddle bag. Requirements: universal: no rack, suitable for streets, copies, etc.), capacity: capacity, when not in use, compact structure, reducing wind resistance, simple storage waterproof and dust-proof: on this basis, we developed this bag: no choice of bicycle models, capacity, expandable design, multi compartment, waterproof and dust-proof, durable, etc. which allows you to focus on riding, and do not worry about using it in harsh environments Colour: Black Material: Polyester Item Type: Back Bags Capacity: 35L-50L Motorcycle Model: All Motorcycle Package Contents: 1X main bag 2X D-buckle accessories 4X 2CM fixed strap Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.