ConvaTec SUR-FIT Natura - 2-Piece Closed Ostomy Bag without Filter has a special coupling ring that makes an audible clicking noise when it is attached to the barrier. This provides reassurance that your ostomy system is secure and makes it easy to apply and remove the pouch. It has comfort panels on both sides of the pouch that reduce noise and odors for more discreet wear. Closed ostomy bags are very convenient to use, simply remove and dispose of the bag when it becomes full. This design also allows you to get longer wear out of your ostomy barrier.