I recently watched Indecent Proposal on a quiet night when Ruben was working late. I remember the first time I saw it I fell in love with Demi Moore's backpack. Well, after seeing it again I'm thinking about trying to recreate it myself. It may very well be beyond my sewing abilities but I think it's worth a try! The one below (from here) is nicely done but very expensive.
With a little searching I came across a similar one from Free People but it's smaller and sold out.
I'll keep you updated if I decide to give it a go.