When you look at a flat piece of undyed leather it is hard to imagine what it can turn into. With the right tools and skills you can make pretty much anything. The transformation that takes place amazes me every time.
The music bag is called a music bag because it was used to carry sheet music around. I don't know if it is better than other bags for this purpose but nonetheless that's whats is called. It can of course still be used for this purpose but if you are a rebel you can put anything you like in it.
The music bag sets itself apart from other bags with is't unusual closure that consist of a bar the interlocks with the handle. Very clever and very easy to open and close.