My bags started leaking on me. I turned on a flashlight and dropped it in the bag and closed it. Light came out up the sides because the trim piesces where the weatherstripping was no longer touched. I'm pretty sure this was caused by overpacking because they weren't always like that.
To fix it, I loosened the screws that holds the trim on, laid the bag on a 2x4, and used a hammer and screwdriver to bend the trim back. Worked pretty good. They no longer leak.