Seems this is the closest thing they currently do. M for 15" (20 ltr) laptops, L for 17" (25 ltr)
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Pro Straps integrate into the bag structure for strength
Rather than the shoulder straps only being stitched on to the pack, they are connected with the same piece of fabric used on the back of the pack. This adds strength/durability to the shoulder straps.
Con Laptop compartment is not seperate from main compartment
In the Big Belly the laptop compartment cannot be opened whilst worn, protecting the laptop to a degree.
Con May not be available everywhere
www.crumpler.eu doesn't list it, and it does not appear in the usual suspects (i.e. Amazon). It might need to be ordered from Australia and shipped.