The variant, J803, 1/2" wider, and 1" higher (and longer?) will hold a small notebook like an 11" mba or ipad, but not a 13" mba. Also, less "European Murse" looking than a Hadley or A&A 😉
It has extra sleeves for papers, both on the backside (not secure, no zipper, but good for quick things like maps, coupons, etc.), and also another letter size pocket between the camera area and two large zippered lens sized pockets. Also has a detachable strap.
However, these are deep vertically for RF's, so unless you are going to stack the bottoms with film or something, you have a lot of extra vertical room or will need more inserts than what you get, which is basically a moveable square camera/lens pocket that can be moved anywhere with velcro attachment at the top portion.
The Lowepro messengers would need extra padding, for my use, but they are cheap, often on sale at best buy for $20.