I decided to try the free bag pattern I got from Hot Patterns.  I used fabric I purchased at Ikea.  Not sure why I purchased that particular fabric on account of I really don't care for it much.  I think my brain just goes stupid when I get into a fabric department.  The bag is really quite large.  Here I have it hanging as you would wear it over your shoulder. 

 This is the other view of it with the magnetic snaps done up.  I think they made a mistake about the placement of the snaps because you cannot wear over your shoulder with snaps done up!!