Thanks for all of the thoughtful input. I do appreciate it. I think I didn't consider the idea of using a hiking backpack that is smaller and won't look ridiculous for a task other than hiking. I kind of assumed they were all huge. I'm going to look into a pack that has the features I need that won't look too silly in a classroom. I'll post what I settle on! Thanks again.

I hear what you're saying about the other considerations to take the load off my shoulders that the bag just lacks design consideration, but...one thing I will say that I wasn't clear about—this bag does have a stiff molded foam insert along the back (for laptop protection). Even with the back packed heavy it rests stiff and flat against my back (with deliberate lumbar contour).

Insert picture from some review (Ogio Squadron):