Abstract: A new convertible sleeping bag for allowing extra insulation to be added for providing added warmth and comfort. The inventive device includes an enclosure comprising a front panel and a rear panel. The front panel and the rear panel are affixed together along a first side edge and a bottom edge and a lower segment of a second side thereof with an upper segment of the second side edge and a top edge of the panels coupled together by a zipper. An interior pocket is secured to an interior surface of the rear panel of the enclosure. The interior pocket has an open upper end for receiving insulating material therein.