petco brand - so phresh high-back corner grey litter box, 26.25" l x 21.5" w x 10" h, standard so phresh the so phresh x-large high-back corner litter box is ideal for large and small spaces thanks to its triangular shape that can sit kitty-cornered in almost any room. made in the u.s. from durable material that's easy to clean, this pan's elevated sides help shield litter scatter and spray.