Originally Posted by TiHabanero

I have used a Presto seat bag for 15+ years without any issues, however it has a more thought out clamp arrangement than the Trek bag. Instead of simply threading into the backing plate, the backing plate, which is fiber reinforced plastic, has nylock nuts inserted in it. These typically do not loosen.
The way Trek does it is flawed in that there is no safeguard to prevent the bolt from backing out of the backing plate, whereas the Presto bag does. Just add a dab of blue Lock-tite to the threads of the bolts and all will be well.