I have used Convatec 2 piece for 18 years, and it has never come apart between the flange and bag. My pouch gets very full at night also, and I have never had an issue.
I like the 2 piece because I use the closed end pouches (hate clips and velcro closures, and it's a nice and soft cloth cover) and I can just change the pouch if I want, you get 30 pouches per box, and most insurances allow 2 boxes a month. I change my pouch at least every day, that way I never have to clean it, just dump and reattach.
I hate having to sit down on a public toilet to empty an open-end pouch also. This way I stand facing the toilet, open and dump the pouch and reattach. If my ostomy is very active and I'm worried about a leak if I take off the pouch, I just have another ready, take off the old, attach the new, wrap the old in tissue and dispose of.
25+years diagnosed with CD.
Numerous surgeries, permanent ostomy, adverse reactions to Remicade, still on Prednisone (my worst enemy), Finally had another surgery hoping for a long remission.