The Polaris Pool Cleaner All Purpose Bag part number K16, fits Polaris 280 pool cleaner. It is designed to capture both large and small debris and filters down to 120 microns. It will capture leaves, twigs, pine needles, and even dirt particles. It’s a reusable bag that is made from tightly woven mesh that helps it to capture almost anything in your pool. Polaris also makes other bags as well the leaf bag and the sand/silt these are more niche bags.