can add whatever closure you like.
For the simplest construction: Leave the white unprinted borders around the edges as these will provide the seam allowance. With the fabric face down, turn down the top edge towards you until you can see the printed area and sew in place leaving enough room to pass a drawstring through. Thread whatever type of cord you wish through the channel you just created. Fold the fat quarter in half with the right sides together and sew along the side and bottom being sure not to sew over the opening for the drawstring. Trim off any excess fabric around the edges leaving about a quarter of an inch from the seams. Turn right side out and enjoy your holiday bag! For a more squared off bottom, sew across the tips of the bottom corners before turning the bag right side out. :)