I do things a little different. I don't sit down!! I always stand to empty with no problems. I lay TP
4-6 sheets in toilette to help keep it clean and to prevent splash back. Even when it is watery output I can keep the closure up till I am ready to empty. A little wipe of end of closure and also I wipe inside the end of the closure to prevent any leakage.
As to your other post I leave my shirt hanging out every time I can. I know its not possible all the time but I don't like to put extra t-shirt or anything that will restrict my stoma from output. I am very self conscience about the puffy pouch and just try to cover it up however I can. ie book, jacket, sweater. I have struggled with this whole thing and yet thankful I do not suffer any more from UC.