I'm not very knowledgeable of TB fabrics and reading the materials glossary past the 4th paragraph makes me feel like I need a large shot of whiskey, so my terms won't be highly accurate but I can see a huge difference between my 4-year-old Bt Orange DLBP (still looks brand new even after massively heavy use) and my 1-year-old Olive TC (rather dirty and scuffed with light use).
I know asking about durability is a loaded question because the term can be subjective. For example, some don't mind fabric that displays scuffs and dirt as long as it's bulletproof; some need a lighter duty bag but want it to repel dirt; and so on. But where I live and our lifestyle (pretty rugged outdoor work and adventures along with frequent town trips and occasional travel) demands both. However, I do take care of my bags so dirt repellent seems to be top of my list. A bit of rain/water protection would also be great, but we're accustomed to dealing with wet around here.
Based on our lifestyle, for future TB purchases, new and used, any suggestions on which fabrics that I should be looking for?