I wanted a cover that I could keep my light in at all times, even when I wasn't using it. So I came up with this design, and it works great! There is a pocket that the light slides into, and a slip at the top for the light itself, to keep it safe. Take the light out of the slip when you want it..and leave it in when you don't! The book light that goes with this cover is an M-Edge e-Luminator, which can be purchased from their website, Staples, Radio Shack... do a Google search for it, and you'll find lots of places.