The zipp speed top tube box offers all the convenience of a classic top tube box but with a few extras to make your time on two wheels that extra bit easier with a zipper running parallel to your top tube the zipp speed box is super quick and easy to open allowing you to spend more time focused on beating out that previous best split time rather than fiddling around getting your essentials the thin layer of padding in the side walls of the bag helps keep things well protected whil