A hard shell, weatherproof top tube mounted bag features a streamlined shape to eliminate leg contact. Large capacity zippered compartment gives cyclists quick and easy access to energy bars, smartphone, tools or any small essential gear they need.Note: Sand, dirt, mud, etc., and bags that are incorrectly pack may cause the bike frame paint in contact areas become dull or scratched over time. To avoid any potential damage, you should protect the frame or rack with foam covering or protective film before attaching bags or panniers.