Take a plastic shopping bag and stuff it horizontally into the tissue box with the handles sticking out of the slit on top.
Don't toss the wrinkled tissue paper after a present-opening frenzy. There are many ways you can reuse it around the house, from packing material to crafts.
Why does an upright box of Kleenex cost more than a horizontal one? When you buy an upright, or cubed, box of tissues, you might get less bang for your buck than if you had purchased a horizontal ...