The Hollister New Image Two-Piece Closed Ostomy Pouch – QuietWear Pouch Material, Filter is part of a two-piece pouching system. The closed pouch is designed to be removed after use. These pouches are most suitable for colostomies or for stomas with less frequent or more predictable output. The AF300 filter allows for a slow release and deodorization of gas from the pouch. The cloth-like QuietWear pouch material helps reduce pouch noise.