The state of Mississippi purchased exclusively double blankets for its troops and provided each soldier with a "pair," with the 6th Mississippi being well documented to have received enough for every soldier in the regiment.  These blankets are copied from an original double blanket used by a Confederate soldier and are a standard 6/4 width (narrower than U.S. Army blankets) , double length, and weigh about 5 pounds total.  And you can't beat that price for two blankets!

Double Blanket - Shiloh