Proof that there are no quilt police here, I cut my strips 4 7/8" and fold in half.
Then sew on top with a 3/4" seam allowance (horrors!) and turn to the back and hand stitch.
The binding is nicely filled; right now I like this wider proportion for quilts that'll get a lot of wear.
If I were to do placemats for instance, I'd go less wide...but that's me.