Why be boring with a plain old bag to carry your books or laptop around?  Why not let everyone think that you're a master of the dark arts and you're on your way to summon a demon or raise the dead?  Now you can amaze those gullible bystanders with this discontinued ThinkGeek Black Magic Spellbook Messenger bag.

Originally sold for $50 the back fetches twice as much online.  However, this one has an annoying zipper that won't latch so I'll sell it at a much lower price.  The flap covers it so only you will know.