√ EVA 3D SHELL: Constructed of high strength EVA with 3D die-casting process.Carbon Fiber Outer with abrasion proof design. Stylish and durable. Stiff sidewalls retain its shape. Internal mesh compartment provide superb protection to the items inside. √ WATERPROOF: High quality PU fabric with seam-sealed 2-way zipper, eliminate the water totally.Keep your electronic supplies dry all the time. Stretch and deformation resistant. √ STABLE FIXING: Shock absorption, anti-pressure, prevent collision and damage to the top tube. Triple Velcro Fixing, easy to install. √ LARGE CAPACITY: Maximizes inner space utilization, mesh design keeps your items organized. Unique shape avoids your legs hitting it. Untie your restraint while cycling. √ CUSTOMER FOCUSED: You are backed by our 100% satisfaction guarantee. We provides 30 days refund or return guarantee if you are not satisfied. Customers satisfaction is our goal.