Mimi Pet Cat Litter Silica Gel Crystals, Ultra Absorbent & Lightweight, 4-Pound Bag One ultra-lightweight 4-pound bag lasts an entire month for 1 cat without changing. 1 bag Mimi litter = 10 bags traditional cat litter. Absorbs and Controls The Odor of Urine and Feces In Seconds. No dust & litter box stays dry--no goopy, clumpy mess or pawprints on the floor. Environmentally Friendly.