Gem,
I started using Coloplast two-piece system at the beginning of the month. The first pouch I replaced after 11 days and the second I still have on. Being my 15th day. No leak in sight. I did use the suggestion someone (was that you Mike) made here about the barrier rings, cutting in half (I cut in thirds), rolling into a rope, and wrapping around the outside of my stoma, then applying the flange. Seems to work really well. I will use a little more next time to make it thicker but otherwise, works well. I am not crazy about the click system on the Coloplast pouch. Cannot burp as easily as the Convatec but love the pouch more!
Gem, this would work well with those Convatec cut-to-fit as well! Probably get you at least a couple extra days from each!
How are they working for you?
Puppy