Something a little different then. Swiss company Rinspeed will be showcasing its newest concept called Dock+Go at the Geneva show next week. Designed by Frank Rinderknecht and built by Peter Kägi and his company 4erC, the concept is actually a tag-on item, essentially an easy-to-dock, single-axle backpack on wheels.

The third on-demand axle pack is modular, so it’s a matter of strapping it on for extended carrying capacity, without creating unnecessary space nor superfluous weight when it’s not needed. For demonstration purposes, the company has selected a smart fortwo as the tango partner.

Different “packs” can turn fortwo into something far more capacious – for instance, a pack can turn the car into a pizza delivery vehicle, complete with a built-in isothermal box. Or it’ll allow winter sports enthusiasts to comfortably stow their gear. In Geneva, Rinspeed is due to show a rolling “sound pack,” which multimedia and infotainment specialist Harman has filled with the latest high-end sound solutions in order to guarantee a first class acoustical experience.

The Dock+Go pack is finished in a silver outer skin from AkzoNobel, with a finish that resembles sparkling ice crystals, and for wheels it wears 7.5-inch AEZ wheels wrapped with 205/40 series low-rolling-resistance Goodyear donuts. Other features to be found on the unit include a PTC heater from Eberspaecher catem (to keep things warm) and a Lumitec EL (electroluminescent) lighting system on the side panels.