SUR-FIT Natura Two-Piece Closed-End Pouch - The SUR-FIT Natura and Natura + Two-Piece Ostomy System is ConvaTec’s most extensive two-piece product line. The SUR-FIT Natura Flange System signals a secure, accurate closure with a series of audible “clicks”. A simple snap-off, snap on design allows users to change the pouch quickly to match activities without removing the skin barrier from the skin.Natura Closed-End Pouches are designed for one-time usage. They are available with a filter that is designed to reduce odor and gas buildup. There's no draining or uncomfortable clip to worry about. When you're ready, you simply remove the pouch, place it into a disposable bag, then discard it.