Bullet Points 1. Expandable Large Capacity for All Riding Needs Basic capacity 30L, expandable up to 48L with the extension zipper. Easily fits a full motorcycle helmet and 16-inch laptop, plus an independent water bottle pocket and multi-layer storage compartments for organized gear storage. 2. Durable Carbon Fiber + Oxford Cloth Material Integrated semi-hard shell design with carbon fiber and oxford cloth splicing, featuring excellent water resistance, drop resistance and wear resistance. Thick and delicate texture ensures long-lasting use during riding. 3. Humanized Details for Convenient Use Hidden zipper pocket on the back for quick access to your phone, paired with bidirectional smooth zippers, adjustable shoulder strap buckles and shaping buckles to fit different body types and usage scenarios. 4. Aerodynamic Streamlined Hard Shell Reduces Wind Resistance The streamlined semi-hard shell design effectively cuts down riding wind resistance and offers great breathability, ensuring comfort even for long-time carrying—combining aesthetics and practicality. 5. Lightweight & Multi-scene Applicable Dimensions: 563720cm, net weight only about 1.3KG. Casual and business style fits riding, commuting and other scenarios. Exquisite hardware accessories highlight superior quality.