The Zipp Speed Box offers the convenience of the classic top-tube box with a few new features to make it more user-friendly. Pulling sideways on a Velcro® panel can be awkward when you’re focused on nailing that bike split, so we put a zipper running parallel to the top tube.Three different sized aero cases (1.0, 2.0 and 3.0) for securely carrying nutrition and small items for easy access.    Solid molded EVA construction.,    Water-resistant seam-sealed zippers.,    Three-point Velcro® strap attachment.,    Molded ZIPP zipper tab.