Lining options for large leather backpack

[gigidept]

Hi All, I'm hoping you kind folks have some insight to help. 

I'm looking for advice on lining. I have a complicated backpack-handbag convertible project I’m working on. There are pockets on both the exterior and interior so this bag is going to need a lining with some structure to it. The client had initially prototyped with a cork-faced fabric, but I found it flaking off. The exterior I think is going to be a 2-3oz veg tan, maybe thicker. Overall dimensions are 14”w x 16”h x 6”d. What kinds of linings would you all suggest? Thanks!

[Rahere]

The pockets will make inverting it for cleaning problematic, so you're talking about a loose liner, for starters. The secret here is that this is the real bag, with the outer as a cover.