Ibera PakRak Quick-Release Commuter Bike Trunk Bag and Seat-Post Bicycle Carrier Rack Combo Smart quick release/clip-on system - Just simply attach and detach bags within few seconds - no straps required! Easy and time saving! Hard base, reinforced, padded main body - A durable polypropylene 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 Come with hand carrying strap/ Detachable padded shoulder strap. Fits most bikes - Especially suited to folding and small wheeled bikes.