Sturdy bag with padded side walls. The main compartment features a double zipper and is covered by an additional fabric flap, under which a jacket or sweater can also be stored. The bottle pocket at the back can be laid flat with a strap. The bag is simply pushed onto the Racktime carrier and locks automatically. To comfortably remove the Rackpack, just press the red button. Click Fix Racktime adapter (included and already mounted). The expertise of both companies has been utilized to combine high-quality carriers with a good attachment system for accessories. Whether it's a basket, box, bag, or dog carrier, the Racktime adapter ensures a secure lock on all Racktime carrier models, quick and easy to handle. The compatible carrier must be purchased separately.