Here are pics of my drawing cases that i have made   The pattern is From Craft Apple

Closed

Open

Pocket Detail

Closed

Open

pocket detail

closed

Open

pocket detail

Several more

This is not a drawing case but instead a mini padfolio

It holds a mini legal pad, some loose paper a pocket for cards and stuff and a pen.  I made this one out of black denim. When you buy the pattern for the drawing cases above from Craft Apple you also get the pattern for this.