I wanted to add the straps before I get more fragile parts added to the front, and I thought I would cut up an old backpack for the straps. When I couldn’t find the bag I was looking for, I came across the straps that came with a portable DVD player case, which we never used. I used thick metal wire to create loops and long supports. I covered the entire back of the cardboard with ¼” thick papier-mâché to hold everything in place.
After the back dried, I added the big band across the bottom, which was constructed out of a Vanilla Coke box. I had to glue a few more pieces in place that will be covered the next time I mix up a new batch of paste.