It looks like it's large enough for a "steno-sized" notepad... I would use it for carrying said notepad, along with a pen, for my Bible Study at church. The pen MIGHT be able to "hook" into the little tab on the side.
Or it could be a case for a Kindle or a tablet.
Is the little tab just that - a tab? and not a drawstring? it would be easy to use as a purse if the tab was a drawstring.
Just some more thoughts on possible uses for this.