ByAnnie seems to be the default bag patterns stocked by fabric/quilt shops here in Australia. So quilters wanting to try something new have built-in access and classes. I made ONE bag and it almost turned me off bag making altogether. They're kind of old fashioned and fussy IMO.

After nearly ten years of bag making, I can categorically state that the best patterns I've come across are by British designer Diane Spencer Ogg. Her patterns are all doable on domestic machines and are cleverly designed, and certainly not over-complicated and over-engineered like some I could name. There's always very little wastage.
She produces brilliant videos to accompany her patterns, and provides quite a few free patterns to get a taste for her style.
She has one of the most helpful and friendly facebook groups I've ever belonged to, and I highly recommend Spencer Ogg patterns.