The plastic hinges are cheap. I changed mine, easy to do, when I got the bike in 08.
I carry an extra pair. I'v been overstuffing my saddle bags for 4 1/2 years now.
It's my daily get to work with some mid distance runaround stuff thrown in.
Lap top and paper work in a back pack on one side, rain suit, MC cover and chit in the other.
They are still good, but, I do like the stainless piano hinge mod.