F-Stop is known for their weather resistant expedition type back-packs. The Sartori is their (and our) largest, toughest backpack. It’s at the upper limit of most airline carryon policies (12×26×10 inches) so for most flights you can put it in the overhead compartment. It has a steel internal frame and constructed of ballistic rip-stop nylon, high density foam, and YKK waterproof zippers to survive bad conditions.
Inside is a separate internal camera unit that is compartmentalized, padded and fully removable so no fumbling through your spare clothes to find your camera equipment. We send it with the default XL internal unit which is 11×19: plenty large enough for a professional-size SLR with 70-200 f/2.8 or larger lens mounted, 4 to 7 spare lenses, flash, backup camera, whatever.
It has a full padded harness with hip, shoulder, and sternum straps; numerous external pockets and attachment loops; a 17 inch laptop sleeve and a large front pocket. If you’re going to do some serious hiking with your gear, this is the backpack you want.