Coloplast SenSura Mio Flex - 2-Piece Opaque Closed Ostomy Bag is made of a neutral gray material and features an inspection window. This is a small transparent area that allows you to monitor the condition of your output if need be. The ostomy bag also has a built-in filter that relieves gas and reduces pouch ballooning. Because the bag and wafer are separate pieces, the pouch can be detached and discarded when it is full without having to remove your ostomy wafer. Coloplast's color coding system makes it easy to select the correct size, ensuring that your wafer and pouch are compatible with one another.