Litter Genie system's five-layer refill bags with built-in odor barrier technology protect against odors and germs. Its unique air-tight design helps keep smells in even when you open the lid. Litter Genie Plus contains: Built-in antimicrobial protection that inhibits odor-causing bacteria. A refill that's 30% longer than the Litter Genie Standard Refill. With Litter Genie Plus, you have a choice of colors, either silver or white.