If you own a cat who likes to make as much of a mess outside the litter box as inside, you might want to consider buying a large cat litter box. Apart from the extra room and comfort for your cat, they usually have high sides so that the litter actually stays inside the litter box rather than falling on the floor around it. For the most part, you can drop by your friendly neighborhood pet store or simply go online and with a few clicks of the mouse, have one delivered to your door. No fuss, no muss.
Large litter box:
Large litter box pictured: IRIS Cat High Sided Litter Pan w/ Scoop, Large, Navy