Pen protector for "Onyx N96 ereader"

I love my ereader, but the design has a flaw, as the pen hangs outside the cover. For this, I made a simple design. The pen tip is covered, the back of the pen snaps into the folder, and a thin layer on top of the ereader decreases the risc (which is a risc) to press buttons by mistake when folded.