Three main compartments comprise this model. Two large compartments and the third is divided in the middle. No external pockets on this model, however the internal capacity is awesome.
Favored by F-15E, B-1, B-2, and C-130 aircrew. It's also popular in the USAF/USN pilot training environment - it just works well in whatever you fly.
Outside dimensions are 9" x 11" x 1" empty, and fully loaded it will expand to 6 1/2" wide. This bag holds a LOT of pubs!