My sister Emily bought a few things at the Harry Potter section of the theme park and asked if we could make a bag before she returned to CO. Upon completion, I was happy to remind her that she could definitely state she had made her bag because she really did at least 50% of the work. She did all the cutting, seam ripping, ironing, hand sewing, etc.
She bought duck cloth from Joann's - which is pretty sturdy stuff - I broke two sewing machine needles while making it.
The ribbon on the strap used to be a lanyard which is supposed to be used for pinning a bunch of theme park pins on it.
We found this cute owl button that looked nice outside the cell phone pocket.