This bag is patterned after a Walmart bag. It was difficult to get good pictures of it because it's black, but it has gussets on the sides, so that it can hold a LOT of stuff. If you want to know the size, just pull out a Walmart bag and there ya go.

The lining is musical note fabric that I got on sale and only had a little of. The outside is black linen-lookalike fabric. The bag is really sturdy, and I think it could hold a lot. If anyone is interested in a tutorial for this bag, here is a link to the one I used.

And a few (bad) pictures of the bag (I might try to get better ones tomorrow when the light is good...).

This picture is of the bag laying down flat with the gussets tucked in...



This picture kind of shows the lining...



And here is a picture of it with some of my music inside. The binder fits all the way in with plenty of room to spare at the top...