The key differences between the Ultralight and the Overland are the wheels, weight and length. The Ultralight is 4.8kg and the Overland is 6.7kg. The Ultralight has PU/rubber mix wheels whilst the Overland has pneumatic air-filled tyres. The Ultralight is 66cm long and the Overland is 73cm. Both the Ultralight and Overland handles have a height range of 82 - 95cm. So, the Overland is a slightly larger piece of kit designed for more mixed terrain. The Ultralight is smaller, designed for urban and indoor environments. Both are very portable and both look great.