I've made this pattern as simple as possible with the least amount of sewing necessary (my least favourite thing to do). It doesn't even need a zipper, as I designed it to have a flap to fold over and hold in your valuables securely.
The pattern is fairly simple and easy to follow, but in case you have a hard time with the fluff stitch, I made a video which shows the technique entitled How to Knit the Fluff or Loop Stitch video on YouTube. In case you don't have access to wifi or are reading a printed version, I also provided pictures and descriptions on how to make the fluff stitch. The pictures are at the end of the pattern.