LitterLocker II Disposal System Refill. The round refill makes it easy to replace the bag in your LitterLocker II. The multilayer bags trap odors and bacteria using AIR-SEAL technology. One refill is equivalent to 60 grocery bags and can last up to two months with one cat. Round refill for the LitterLocker II Durable multilayer bags Traps odors and bacteria Made in Canada Dimensions: 7 x 11.8 in