Prior to me breaking the bag i too was using it as a crossbody bag but had only put my phone and some money in there.
Regarding the construction, i got a pretty good view of it when the bag broke. So it appears that the leather on the side panel is not attached to the lining except at the seams . The side panel appears to be one piece of leather, there is a slit in this leather and another piece of leather has been slipped through (this is the leather that holds the d ring). The extra leather that holds the d ring is in the shape of a rectangle so as to leave enough leather on either side of the d ring (which sits underneath the main leather side panel) to give it more area for reinforcement. There are about 3 stitches on the sides of the d ring which holds the together the main side leather piece and small leather piece around the d ring. What i found interesting and disappointing was there is no stitching that holds together the leather loop around the d ring (across the two sides). Ive tried to draw a picture to demonstrate my description. Essentially once it ripped open the d ring could now fall out because there was nothing holding the leather on the sides of the d ring together making the bag only functional as a clutch. I only use handsfree bags so i took the risk of trying to do a diy fix.
In terms of how durable the bag is, considering all i had in the bag was a phone and 2 plastic bags, i would say it would have eventually broke if i overloaded the bag or did another activity with impact (eg dancing At a music festival, flinging the bag into the car over a period of time, etc). I always thought epi pieces are very durable thats why i got an epi pochette accessoires but i didn't do my usual research and look for review posts or videos before purchasing
View attachment 4242377 , maybe i should have bought a canvas one instead.