Astronauts aboard space station prepare to unpack cargo

Astronauts aboard the international space station and the newly arrived shuttle Endeavour planned Monday to start unpacking a new toilet and a contraption that purifies urine and sweat into drinkable water at the orbiting outpost.

The main business of the day is unloading a cargo container nicknamed “Leonardo” from space shuttle Endeavour’s belly and attaching it to the international space station. Inside the 21-foot-long container is almost 15,000 pounds of equipment that will allow the space station to expand from three to six crew members next year.

“Things are going exceedingly well,” said LeRoy Cain, chairman of the mission management team.

Besides the extra bathroom and urine processor, Endeavour delivered an exercise machine, kitchenette and two sleeping compartments. Endeavour docked with the space station Sunday afternoon almost two days after it launched from Florida.