The Zodiac Polaris 3900 Sport Pool Cleaner Double Double Chamber Bag is a high-quality replacement pool cleaner bag designed specifically for Zodiac Polaris 3900 Sport model. Made by ATIE, this bag is suitable for in-ground pools and provides efficient cleaning performance. With its double chamber design, this pool cleaner bag ensures maximum filtration and captures debris effectively, making it an essential tool for maintaining a clean and clear pool.