I have used Hollister two piece New Image CeraPlus #11203 flange and bag number 18133, ventless, sense my surgery in 2017. I don't like the bags that are vented because they cause pancaking on my stoma in the bag and there's no way for it to fall to the bottom because it sucks all the air out of the bag, and leaves no breathable space. After I have cleaned my skin around the stoma where the flange goes I use an alcohol swab or two, to clean the skin around the stoma where the flange will be put on so that it cleans all the bacteria off my skin so I am not putting the flange on bacteria that will cause my skin to break down or get ulcers or rashes. I then put adapt stoma powder also around my stoma over the alcohol clean skin and a bead of adapt paste all the way around the stoma also. I have no trouble with my bag staying adhered to my skin for up to 7 days. I have had no skin problems. This has been very successful for me from the beginning of my time with my stoma.