Which is why today's first launch of Japan's HTV cargo vehicle is so important. The HTV will be one of the principal moving vans for carrying supplies up to the station, along with Europe's ATV, Russian Progress capsules, the shuttle (until its retirement), and eventually, commercial cargo vehicles. The shuttle has the most capacity—14 metric tons. The ATV carries 7.5 tons, the HTV 6 tons, and the Progress 2.5 tons.
The HTV is scheduled to dock automatically with the station next Friday, September 18. Follow its progress here.