Mass & Volume is an EP by American grindcore band Pig Destroyer which was released on March 5, 2013 as a digital release and October 14, 2014 as a physical release through Relapse Records. The EP was written and recorded during the final day of the Phantom Limb sessions. It is dedicated to the memory of Pat Egan, a member of the Relapse Records family who died on February 18, 2013. All proceeds from the sale of the record were donated to Egan's daughter's college fund.