This is an unusual bag in that the two straps aren't the same length as you can see. It is carried by slipping the long strap through the short one. I sewed this Japanese Knot Bag (with colorful cat faces on it!) using a tutorial from Helen Heath but when I tried to find it again, I couldn't. Sorry!
It is a really neat bag and very easy to sew. It is actually reversible also. I changed the side seams, slightly curving them out to make it easier to sew.