4 to 5 seats, it depends on which model you get i think.
The 2005 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.
The 2012 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.
The 2008 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.
The 2007 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.
The 2003 Mercedes-Benz SL-Class has 10.1 cu.ft. of cargo capacity with all of its seats in place.
The 2014 Mercedes-Benz SL-Class has 13.5 cu.ft. of cargo capacity with all of its seats in place.
The 2006 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.
The 2004 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.
The 2011 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.
The 2013 Mercedes-Benz SL-Class has 13.5 cu.ft. of cargo capacity with all of its seats in place.
The 2002 Mercedes-Benz SL-Class has 7.9 cu.ft. of cargo capacity with all of its seats in place.
The 2009 Mercedes-Benz SL-Class has 10.2 cu.ft. of cargo capacity with all of its seats in place.