Ibera 2 in 1 PakRak Commuter Bicycle Trunk Bag with Expandable Panniers, Clip On Quick Release Design and Detachable Shoulder Strap Smart quick release/clip-on system - Just simply attach and detach bags within few seconds - no straps required! Easy and time saving! Built-in foldaway panniers  This bike bag can be trunk bag and pannier at the same time. Hard base, reinforced, padded main body - A durable carbon-patterned ABS base allows the bag to be set down on wet surfaces, protecting the cargo within. Night riding safety - 360 Degree Reflective trim/ Taillight hanger design Ideal for weekend bike touring. Carry school books, groceries, a change of clothes, bike gear, and all your small stuff.