As the US strategic petroleum reserve (SPR) approaches capacity (721.5 million barrels filled out of a total possible 727 million, and will be filled by January 2010), the federal government will fade out of the oil-buying business. Some bearish traders believe that this factor can weigh in on prices, since most petroleum stocks in the United States are government-held rather than private. Bullish traders have also used the filling of the Chinese SPR as a reason that oil should go much higher.