This is easy, eco friendly, inexpensive and effective. Works on small soaps as well as large. For cp soaps...it allows the soap to breath. For mp soap...wrap in plastic first.
You can use any standard typing, computer, copy paper, or decorative. Print your own design or logo, write a note on the inside then fold it around the soap. I have noticed the cheaper papers breathe better so don't spend a stack on the good stuff when the cheaper stuff works best.