Things You'll Need
Instructions
Cut a rectangle of fleece 1 inch wider and longer than the desired dimensions of the sack. If the sack will be used on the outside of a sleeping bag, cut the fleece 4 inches longer and wider than the bag. Cut it the same length as the bag, and 3 inches narrower if it is to be used inside the bag.
Cut a rectangle for the top of the sack, 12 inches shorter than the first rectangle.
Pin the top of the sack to the bottom, with the side and bottom edges aligned.
Set the sewing machine to sew a straight stitch with a standard stitch length. Sew the top of the sack to the bottom by sewing 1/2 inch from the side and bottom edges. Leave one short edge open.