Abstract: A customizable liner and sifter set, with a flat bottom, for an animal litter box and the method to use the said liner and sifter is disclosed. Some animals that use a litter box include a cat, rabbit, ferret, small pigs & small dogs. The size of a customizable litter liner and sifter can be a square, rectangular, cross-shaped, or oblong shaped that tightly fits into the animal litter box of various sizes and shapes. The said customizable liner and sifter set are specifically designed to facilitate the cleanup process of the animal excrement and to make the cleaning chore easy and less unpleasant. The novel customizable liner of the present invention tightly fits into the bottom and upper lip of the designated animal litter box and when filled with litter separates the animal litter box and the litter. It is easily removable by gathering up the drawtapes, and discarding the whole liner, litter & waste into the trash.