Here is a simple pillowcase sized drawstring bag tutorial. I am happily posting this for my fellow Soldiers Angels sewing team members.
You are going to need at least 30" x WOF (width of fabric) of cotton fabric and a yard of ribbon or cord for the drawstring.
I cut my fabric 30" by 40".
Fold the fabric in half, right sides together with the fold at the top edge. Sew across the bottom at 5/8". On the side seam, mark 2" from the top where the drawstring opening is going to be. Sew the side seam from that 2" mark down to the bottom and press seam open at the top.