there are actually 6 compartments in this bag- the front one, which has a gusset so it is about 1" deep, the main one, and then on the front and back "walls" of the bag there is another section and a zipped compartment inside that-the zippers are installed well, no snagging. the pic they show of the inside has the same setup on the front of the bag. quality overall is very good- the shoulder strap on mine has a seam where two pieces were sewn together- that's something that's the luck of the draw as to whether your bag would have it. so far (one month of heavy use) it's held up fine, time will tell. i love this bag, and would buy it again in a minute.
I didn't read the measurements before I ordered; what I was expecting was a bag that was wider rather than taller. It's good quality but not what I envisioned a messenger bag to be.
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