I was going to say Chrome, but they don't seem to make my bag anymore. On the other hand the important part is, when the material along the zipper wore out after five years, they replaced the bag no questions asked, because it was normal wear. It's a lifetime warranty, plus a one year guarantee. The replacement had a better zipper design with a bit more flexibility, so I expect it to last longer.

Of their existing bags, the Hondo seems closest to what I have.

That being said, I have something from Deuter and that's the most comfortable, but I can't speak to its longevity. Though they do have a lifetime warranty where they will attempt repairs.