Did anyone try the Under-The-Jack Pack? I am wondering how visible it is really? How comfortable? The only video review I could find doesn't even show the back of the guy wearing this ... thing.
I would think the visibility factor would be totally dependent on what sort of jacket you are wearing. A loose fitting jacket would drape over it without revealing edges, a thin windbreaker or fitted suit would likely show the edges.
But from a travel point of view, it seems like it would not be comfortable when riding buses, subways, trains or planes, unless you remove your jacket and take off the backpack, at which point in time the concealment value is nil.
About the only real value in travel would be if you plan to go drinking with your laptop in tow in a seedy part of town.
That said, the thin form factor seems good simply because it keeps the pack from flopping around like a normal backpack with a laptop inside would.