SmartSift Replacement Liners for Pull-Out Waste Bin 40 x 25 x 22 cmSpecially designed for Catit Design SmartSift, these replacement liners make managing the cat's litter very convenient. Easy to install, the liners are designed to fit perfectly in the waste bin. They are very effective at preventing waste clumps from sticking to the waste bin's surface, making cleanups so much easier. When the liner is full, simply remove and discard it. They can hold up to 2 weeks worth of waste. 12 liners per pack