Let's say I have a backpack. It is a typical bag like this but say it is made of inferior quality. One time I wash it and since than I have been observing that the black body of the bag has been disintegrating. I see small black pieces lying on the floor which came from the bag's outer black layer.
My question is what is the right word( or in this case verb) to describe this phenomenon. I think the word I am looking for would also apply for a old pullover with some design or print on it; and since it is old and worn out, that material is starting to fall off.
I want to used the word in this sense
The bag or the cloth is so old/ worn out/ inferior that it is starting to (the word I am looking for).
However I am fine with other constructs also in same sense.