With wrong side of fabric up fold over 1 1/2" on the long edge and press. Do this to only two of the three 4" x 6" rectangles.
Secure everything with pins and sew together using a 1/4" seam. Make sure not to sew the long edges of the straps, otherwise you'll have a pocket :)
Turn right side out, add Velcro to the strap ends, insert tissue packet through opening and secure around visor. Voilà a cute tissue-pack holder for the car!