Thanks. This is very helpful.
The black california latigo sounds nice, but I really want my bag to age like these shoes in the attachment. Hide house said they didn't have anything like that. I know chromexcel will give me this effect, but it's not stiff enough to standup. That is why I was considering a stiffener for the gusset
I was considering the vinyl because I also need an internal fabric to sew pleats on a motorcycle seat. This bag is for a motorcycle saddlebag, so it could get caught in the rain.
Yes, I think nylon webbing is what I heard others use (like Saddleback). Thanks.