This question has been overlooked by cat owners for ages: "Why spend so much on cat scratchers every year?" We figured cat owners can greatly minimize waste , and save hundreds of dollars on scratchers alone with this one simple feature called... interchangeability. The picture to the left says it all. Both waste bins have the equivalent of about 9 months of cat scratcher waste. The left bin has your typical cat scratchers, whereas the right bin has our scratching posts... I'l let you take your pick!