I'd say whatever holds is fine. I've often wondered what I would do if I punctured the bag with anything. It hasn't happened yet. I'm just grateful that I've gotten through five months at work with no leaks or disasters of any kind.
OUt of curiosity, how long does the American health care system expect you to use one one-piece bag? I am allowed one per day, but I figured out that it's better for the skin around my stoma if I change the bag every two days, but not longer, because I was wearing the same one into the third night, last night, and woke up with a leakage.
Proud of myself: didn't get emotional at all, just got myself up and changed and back to bed and sleep.