I love my Roomba but the parts (disposable bags) are very expensive when you buy them from iRobot so I decided to give these a try. Double the bags for 1/2 the price! Pleasantly surprised that they fit perfectly and work well. The only difference is that it takes 2-3 runs to empty the container into the bag instead of one run with big brands. I'll live with it! :) will definitely buy them again!