I use the wolfman expedition also.
I am downsizing to the the large rollie bags (smaller than the expedition) as the expedition setup is pretty wide.
I have got hung up on 'stuff'
and need to narrow it down.
So less gear, less width. I downsized on my sleeping (by 1/2!) to allow myself to do this, which is contained in my top duffel.
Its a puzzle to get everything small/tight.
Pretty waterproof although I put many things in plastic bags to ensure dryness.