Mission Workshop Fitzroy Bag
"The Fitzroy is an impenetrable fortress of a pack that holds and protects all of your gear, cargo, and valuables from morning's start to the day's end. Built to last a lifetime with waterproof fabrics and military spec. construction.
The Fitzroy also features multiple weatherproof compartments, urethane coated zippers, waterproof materials, and an internal frame sheet. Large zippered pocket fits most 17'' laptops, with smaller zippered pockets for your gear."
Bicycle Coffee takes up the job using Fitzroy for work. Check it.