If You want something easy you could take two long rectangle pieces of fabric and sew all around it with the right sides together. Leave a four inch opening to turn it. Then clip off the tips at the corners. Turn, and straighten out and press the fabrics flat. Hand stitch the opening closed. Then turn about one third of the fabric rectangle right sides together, stitch at a quarter inch to the fold from the bottom and then back down to reinforce it. Then turn the little envelope right side out and attach a braided strap from one side to the other about an inch from the top of the sides. Oh, The unsewn one third part is the flap in the front. Very simple but quick!