The PLUS System is a new transportation system for bicycles. It consists of two luggage carriers, with a variety of accessories. The core elements of the system are the rails on top of the carriers. The accessories can be slid easily, quickly and securely onto the rails, without any use of tools. They have a clear family resemblance and are compatible with both carriers. It is possible to combine both a child seat and a bag on the carrier. Fixing the child seat wrongly is impossible, thanks to a unique and adjustable connection system. All connection points fullfill high safety standards and are equipped with double safety functions.