Looking at getting an Ogio backpack from
here. I've got the hookup through my work to get them for half of the listed price.
I'm thinking either
the Fugitive or
the Kirby. Since I can get them kinda cheap, I won't mind cutting out some of the inside dividers and then will make an internal frame.
Edit: The Fugitive is 10" deep while the Kirby is only 7" ... looks like I'm going to order a Fugitive on Monday