It’s a good question! I’m maybe most heavy on the drawstring, which over time always pulls through some frayed fabric and then starts clogging up the mechanism. This time, the nylon (?) lining of the main pouch has started fraying at the top leaving wispy bits of unraveling nylon everywhere. And the rear pocket lining always starts breaking into little black flakes. I’ve maybe been unlucky, but I’m quite hard on kit too!What are you doing to your treat bag