Fits iRobot Verro 500 pretty well. I bought it after reading Stickywire's review and indeed, it works! Also, it cleans easier than the original. I always hand wash these filter bags and with the original, I had to rub a lot to get those algae out until I can't rub anymore as my hands start to ache, but this one is easier to clean.
Rating: [5 of 5 Stars!]