These biodegradable replacement liners have been specifically designed for the Catit Design SmartSift and make managing cat litter very convenient. The liners are easy to install and fit perfectly in the waste container. They effectively prevent waste clumps from sticking to the surface of the waste container, making cleaning significantly easier. When the bag is full, simply remove it and dispose of it. The liners are environmentally friendly and break down in an organic or regular landfill. They can hold waste for up to two weeks.