After researching many shoulder briefcase bags, I'm convinced this one is perhaps the most durable and expandable for the price. I need a long bag and 5 inch width for the kinds of books and laptop that I own.
Its only drawback is the ridiculously flimsy paperclip-thin clips for the neoprene hooks on rhe shoulder strap. They started coming out of their "spring holes" by the 3rd week of use and one fell off on the NYC subway last night. Now I'm substituting a shoulder strap from an industrial level travel bag. But generally, this bag and its many small compartments for pencils, pens, little notebooks, calculators, markers, highlighters and teaching implements really works for me.