3-in-1, the Azur Expandable Rack Top Bag features a main rack bag and 2 side pannier bags which unfold for additional carrying capacity. The bag is collapsible and features a detachable shoulder strap for when you want to take it with you. This bag is also lined with 3M reflective strips on all sides, improvising visibility in low light conditions. Other handy features include a bottle holder, mesh external and internal pockets, and a generous main compartment lined with water resistant fabric lining.