Hi lovely,
I use the same wafer with the new thinner bags as I did with the thicker ones so I can rule this out in my case. After my last change (both wafer and bag), I took a nap. When I woke up, the odor was so strong I was certain I had a leak. Checked everything with no leak to be found.
From what I understand, there is a difference in output between a colostomy and an ileostomy – in frequency and consistency. Also, my diet hasn't changed at all since the new bags have come out.