The author of the project addresses the issue of moving around big cities with luggage. He strives to find an affordable, simple, and durable solution as an alternative to cars and public transport. His response is a bike combined with a modular trailer, whose construction makes it possible to change the function of the vehicle quickly. There are three configuration options. In the basic version, a detachable bag is fixed to a two-wheel trailer to protect the luggage from changeable weather conditions. In the cargo version, large-size objects can be transported in the trailer. Finally, in the third version, a child car seat with a frame and a cover is fixed to the vehicle, so the user can bring a kid along.