Thank you for your response. I've done everything you've stated (even cutting the zipper underneath & using a 1/4" seam), except my "square" was 1 1/4" - thought it would help & it did somewhat. I did make this bag & it turned out pretty good. The corners still aren't boxy, but it's ok. I'm going to make another one again & try it exactly how you do it. Thanks again for this, I love learning something new.