The bag is simply slid onto the Racktime carrier and locks automatically. To comfortably remove it, just press the red button. It comes with a reflector, lamp holder, and KlickFix Racktime adapter (included and already mounted). The KlickFix/Racktime adapter is the result of a successful collaboration between Tubus and Rixen & Kaul. The expertise of both companies has been utilized to combine high-quality carriers with a perfect attachment system for accessories. Whether it's a basket, box, bag, or dog basket, the Racktime adapter ensures a secure lock on all Racktime carrier models, quick and easy to handle.