Most of the envelopes had wrinkles in them apparently caused during manufacture. They weren't too unsightly so I went ahead and used them. More importantly the glue adheres really well which is most important to me. Also important I only had one envelope out of about 200 jam in my Brother B/W printer. I will buy these again.
These envelopes are less porous than others I've used and take fountain pen ink better than others. I just wish I could find copy/laser printing paper with the same surface.