I used this pattern to make it found on etsy. I did the strap a little different because I could not find the sliders anywhere!! It is a set length and I also widened it to be 1 1/2" wide finished. It also has stiff interfacing in it as well as the interior of the bag.
On the inside I did my own thing as far as pockets go. I love having lots of pockets and am happy with how much I can probably fit in here. It will be a great and cute bag to use. I'm just so afraid it will get filthy dirty fast! oh well! :) I love it!